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664043540 = 225191747483
BaseRepresentation
bin100111100101001…
…000000000010100
31201021111220111012
4213211020000110
52324443343130
6145520431352
722312163666
oct4745100024
91637456435
10664043540
11310920816
12166478558
13a7760194
1464298536
153d46d995
hex27948014

664043540 has 24 divisors (see below), whose sum is σ = 1467886560. Its totient is φ = 251637408.

The previous prime is 664043533. The next prime is 664043543. The reversal of 664043540 is 45340466.

It is a junction number, because it is equal to n+sod(n) for n = 664043497 and 664043506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664043543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 873362 + ... + 874121.

It is an arithmetic number, because the mean of its divisors is an integer number (61161940).

Almost surely, 2664043540 is an apocalyptic number.

It is an amenable number.

664043540 is an abundant number, since it is smaller than the sum of its proper divisors (803843020).

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

664043540 is a wasteful number, since it uses less digits than its factorization.

664043540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747511 (or 1747509 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 664043540 is about 25769.0422794484. The cubic root of 664043540 is about 872.4332026048.

The spelling of 664043540 in words is "six hundred sixty-four million, forty-three thousand, five hundred forty".

Divisors: 1 2 4 5 10 19 20 38 76 95 190 380 1747483 3494966 6989932 8737415 17474830 33202177 34949660 66404354 132808708 166010885 332021770 664043540