640082776 has 16 divisors (see below), whose sum is σ = 1270752840. Its totient is φ = 301215360.

The previous prime is 640082741. The next prime is 640082791. The reversal of 640082776 is 677280046.

It is a congruent number.

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, 2353110 + ... + 2353381.

Almost surely, 2^640082776 is an apocalyptic number.

It is an amenable number.

640082776 is a deficient number, since it is larger than the sum of its proper divisors (630670064).

640082776 is a wasteful number, since it uses less digits than its factorization.

640082776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4706514 (or 4706510 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 640082776 is about 25299.8572327988. The cubic root of 640082776 is about 861.8110276373.

The spelling of 640082776 in words is "six hundred forty million, eighty-two thousand, seven hundred seventy-six".