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31044040 = 2351771643
BaseRepresentation
bin111011001101…
…1000111001000
32011102012102021
41312123013020
530421402130
63025214224
7524604256
oct166330710
964365367
1031044040
1116583935
12a491374
13657c271
1441a15d6
152ad337a
hex1d9b1c8

31044040 has 64 divisors (see below), whose sum is σ = 75116160. Its totient is φ = 11504640.

The previous prime is 31044031. The next prime is 31044049. The reversal of 31044040 is 4044013.

It is an interprime number because it is at equal distance from previous prime (31044031) and next prime (31044049).

It is not an unprimeable number, because it can be changed into a prime (31044049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47959 + ... + 48601.

It is an arithmetic number, because the mean of its divisors is an integer number (1173690).

Almost surely, 231044040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31044040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37558080).

31044040 is an abundant number, since it is smaller than the sum of its proper divisors (44072120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31044040 is a wasteful number, since it uses less digits than its factorization.

31044040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742 (or 738 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 31044040 is about 5571.7178679470. The cubic root of 31044040 is about 314.2867544239.

Adding to 31044040 its reverse (4044013), we get a palindrome (35088053).

The spelling of 31044040 in words is "thirty-one million, forty-four thousand, forty".

Divisors: 1 2 4 5 8 10 17 20 34 40 68 71 85 136 142 170 284 340 355 568 643 680 710 1207 1286 1420 2414 2572 2840 3215 4828 5144 6035 6430 9656 10931 12070 12860 21862 24140 25720 43724 45653 48280 54655 87448 91306 109310 182612 218620 228265 365224 437240 456530 776101 913060 1552202 1826120 3104404 3880505 6208808 7761010 15522020 31044040