640893376 has 14 divisors (see below), whose sum is σ = 1271772920. Its totient is φ = 320446656.

The previous prime is 640893347. The next prime is 640893443. The reversal of 640893376 is 673398046.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5006916 + ... + 5007043.

Almost surely, 2^640893376 is an apocalyptic number.

It is an amenable number.

640893376 is a deficient number, since it is larger than the sum of its proper divisors (630879544).

640893376 is a wasteful number, since it uses less digits than its factorization.

640893376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10013971 (or 10013961 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 46.

The square root of 640893376 is about 25315.8720173728. The cubic root of 640893376 is about 862.1746729642.

The spelling of 640893376 in words is "six hundred forty million, eight hundred ninety-three thousand, three hundred seventy-six".