640458512 has 40 divisors (see below), whose sum is σ = 1310749440. Its totient is φ = 302682240.

The previous prime is 640458509. The next prime is 640458521. The reversal of 640458512 is 215854046.

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 7 ways as a sum of consecutive naturals, for example, 6314 + ... + 36342.

It is an arithmetic number, because the mean of its divisors is an integer number (32768736).

Almost surely, 2^640458512 is an apocalyptic number.

640458512 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640458512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (655374720).

640458512 is an abundant number, since it is smaller than the sum of its proper divisors (670290928).

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

640458512 is a wasteful number, since it uses less digits than its factorization.

640458512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30111 (or 30105 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 35.

The square root of 640458512 is about 25307.2817979332. The cubic root of 640458512 is about 861.9796256689.

The spelling of 640458512 in words is "six hundred forty million, four hundred fifty-eight thousand, five hundred twelve".