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642544 = 2475737
BaseRepresentation
bin10011100110111110000
31012122101221
42130313300
5131030134
621434424
75314210
oct2346760
91178357
10642544
113a9831
1226ba14
13196606
1412a240
15ca5b4
hex9cdf0

642544 has 20 divisors (see below), whose sum is σ = 1423024. Its totient is φ = 275328.

The previous prime is 642533. The next prime is 642547. The reversal of 642544 is 445246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2757 + ... + 2980.

2642544 is an apocalyptic number.

It is an amenable number.

642544 is an abundant number, since it is smaller than the sum of its proper divisors (780480).

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

642544 is a wasteful number, since it uses less digits than its factorization.

642544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5752 (or 5746 counting only the distinct ones).

The product of its digits is 3840, while the sum is 25.

The square root of 642544 is about 801.5884230701. The cubic root of 642544 is about 86.2914216779.

The spelling of 642544 in words is "six hundred forty-two thousand, five hundred forty-four".

Divisors: 1 2 4 7 8 14 16 28 56 112 5737 11474 22948 40159 45896 80318 91792 160636 321272 642544