640462460 has 24 divisors (see below), whose sum is σ = 1467241776. Its totient is φ = 232895360.

The previous prime is 640462457. The next prime is 640462483. The reversal of 640462460 is 64264046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1455377 + ... + 1455816.

It is an arithmetic number, because the mean of its divisors is an integer number (61135074).

Almost surely, 2^640462460 is an apocalyptic number.

It is an amenable number.

640462460 is an abundant number, since it is smaller than the sum of its proper divisors (826779316).

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

640462460 is a wasteful number, since it uses less digits than its factorization.

640462460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2911213 (or 2911211 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 640462460 is about 25307.3597990782. The cubic root of 640462460 is about 861.9813968419.

The spelling of 640462460 in words is "six hundred forty million, four hundred sixty-two thousand, four hundred sixty".