664874136 has 64 divisors (see below), whose sum is σ = 1877186400. Its totient is φ = 217987200.

The previous prime is 664874117. The next prime is 664874141. The reversal of 664874136 is 631478466.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 664874091 and 664874100.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12055 + ... + 38406.

Almost surely, 2^664874136 is an apocalyptic number.

It is an amenable number.

664874136 is an abundant number, since it is smaller than the sum of its proper divisors (1212312264).

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

664874136 is a wasteful number, since it uses less digits than its factorization.

664874136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50537 (or 50527 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 664874136 is about 25785.1534026850. The cubic root of 664874136 is about 872.7968020600.

The spelling of 664874136 in words is "six hundred sixty-four million, eight hundred seventy-four thousand, one hundred thirty-six".