640082775 has 36 divisors (see below), whose sum is σ = 1084924856. Its totient is φ = 332985600.

The previous prime is 640082741. The next prime is 640082791. The reversal of 640082775 is 577280046.

It is not a de Polignac number, because 640082775 - 2⁶ = 640082711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 123537 + ... + 128613.

Almost surely, 2^640082775 is an apocalyptic number.

640082775 is a deficient number, since it is larger than the sum of its proper divisors (444842081).

640082775 is a wasteful number, since it uses less digits than its factorization.

640082775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5172 (or 5126 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 640082775 is about 25299.8572130358. The cubic root of 640082775 is about 861.8110271885.

The spelling of 640082775 in words is "six hundred forty million, eighty-two thousand, seven hundred seventy-five".