640480288 has 24 divisors (see below), whose sum is σ = 1441081152. Its totient is φ = 274491456.

The previous prime is 640480277. The next prime is 640480363. The reversal of 640480288 is 882084046.

It is a self number, because there is not a number n which added to its sum of digits gives 640480288.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1429420 + ... + 1429867.

It is an arithmetic number, because the mean of its divisors is an integer number (60045048).

Almost surely, 2^640480288 is an apocalyptic number.

It is an amenable number.

640480288 is an abundant number, since it is smaller than the sum of its proper divisors (800600864).

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

640480288 is a wasteful number, since it uses less digits than its factorization.

640480288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2859304 (or 2859296 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 40.

The square root of 640480288 is about 25307.7120261789. The cubic root of 640480288 is about 861.9893948448.

The spelling of 640480288 in words is "six hundred forty million, four hundred eighty thousand, two hundred eighty-eight".