640503792 has 30 divisors (see below), whose sum is σ = 1792521432. Its totient is φ = 213501216.

The previous prime is 640503761. The next prime is 640503811. The reversal of 640503792 is 297305046.

640503792 is a `hidden beast` number, since 64 + 0 + 503 + 7 + 92 = 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 polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2223828 + ... + 2224115.

Almost surely, 2^640503792 is an apocalyptic number.

It is an amenable number.

640503792 is an abundant number, since it is smaller than the sum of its proper divisors (1152017640).

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

640503792 is a wasteful number, since it uses less digits than its factorization.

640503792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4447957 (or 4447948 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 640503792 is about 25308.1763862986. The cubic root of 640503792 is about 861.9999389897. Note that the first 4 decimals are identical.

The spelling of 640503792 in words is "six hundred forty million, five hundred three thousand, seven hundred ninety-two".