640974148 has 12 divisors (see below), whose sum is σ = 1121892352. Its totient is φ = 320433480.

The previous prime is 640974133. The next prime is 640974161. The reversal of 640974148 is 841479046.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

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, 27133 + ... + 44923.

Almost surely, 2^640974148 is an apocalyptic number.

It is an amenable number.

640974148 is a deficient number, since it is larger than the sum of its proper divisors (480918204).

640974148 is a wasteful number, since it uses less digits than its factorization.

640974148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26802 (or 26800 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 640974148 is about 25317.4672508922. The cubic root of 640974148 is about 862.2108914940.

The spelling of 640974148 in words is "six hundred forty million, nine hundred seventy-four thousand, one hundred forty-eight".