640312515304 has 128 divisors (see below), whose sum is σ = 1533152839680. Its totient is φ = 243430790400.

The previous prime is 640312515277. The next prime is 640312515391. The reversal of 640312515304 is 403515213046.

It is a super-3 number, since 3×640312515304³ (a number of 36 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 640312515304.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28145374 + ... + 28168114.

It is an arithmetic number, because the mean of its divisors is an integer number (11977756560).

Almost surely, 2^640312515304 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640312515304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (766576419840).

640312515304 is an abundant number, since it is smaller than the sum of its proper divisors (892840324376).

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

640312515304 is a wasteful number, since it uses less digits than its factorization.

640312515304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23871 (or 23867 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The spelling of 640312515304 in words is "six hundred forty billion, three hundred twelve million, five hundred fifteen thousand, three hundred four".