642537072 has 60 divisors (see below), whose sum is σ = 1815711664. Its totient is φ = 212094720.

The previous prime is 642537061. The next prime is 642537109. The reversal of 642537072 is 270735246.

It is a happy number.

642537072 is a `hidden beast` number, since 642 + 5 + 3 + 7 + 0 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 6829 + ... + 36492.

Almost surely, 2^642537072 is an apocalyptic number.

It is an amenable number.

642537072 is an abundant number, since it is smaller than the sum of its proper divisors (1173174592).

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

642537072 is a wasteful number, since it uses less digits than its factorization.

642537072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43438 (or 43429 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 36.

The square root of 642537072 is about 25348.3149735835. The cubic root of 642537072 is about 862.9111154136.

The spelling of 642537072 in words is "six hundred forty-two million, five hundred thirty-seven thousand, seventy-two".