640062724 has 48 divisors (see below), whose sum is σ = 1299715200. Its totient is φ = 270141696.

The previous prime is 640062701. The next prime is 640062743. The reversal of 640062724 is 427260046.

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 15 ways as a sum of consecutive naturals, for example, 1043842 + ... + 1044454.

It is an arithmetic number, because the mean of its divisors is an integer number (27077400).

Almost surely, 2^640062724 is an apocalyptic number.

It is an amenable number.

640062724 is an abundant number, since it is smaller than the sum of its proper divisors (659652476).

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

640062724 is a wasteful number, since it uses less digits than its factorization.

640062724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132 (or 1130 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 640062724 is about 25299.4609428739. The cubic root of 640062724 is about 861.8020281684.

The spelling of 640062724 in words is "six hundred forty million, sixty-two thousand, seven hundred twenty-four".