640362520 has 32 divisors (see below), whose sum is σ = 1646647200. Its totient is φ = 219552768.

The previous prime is 640362517. The next prime is 640362533. The reversal of 640362520 is 25263046.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1143225 + ... + 1143784.

It is an arithmetic number, because the mean of its divisors is an integer number (51457725).

Almost surely, 2^640362520 is an apocalyptic number.

It is an amenable number.

640362520 is an abundant number, since it is smaller than the sum of its proper divisors (1006284680).

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

640362520 is a wasteful number, since it uses less digits than its factorization.

640362520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2287027 (or 2287023 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 640362520 is about 25305.3851976215. The cubic root of 640362520 is about 861.9365589800.

The spelling of 640362520 in words is "six hundred forty million, three hundred sixty-two thousand, five hundred twenty".