664390692 has 36 divisors (see below), whose sum is σ = 1919351616. Its totient is φ = 189825840.

The previous prime is 664390687. The next prime is 664390709. The reversal of 664390692 is 296093466.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1317984 + ... + 1318487.

Almost surely, 2^664390692 is an apocalyptic number.

It is an amenable number.

664390692 is an abundant number, since it is smaller than the sum of its proper divisors (1254960924).

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

664390692 is a wasteful number, since it uses less digits than its factorization.

664390692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2636488 (or 2636483 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The square root of 664390692 is about 25775.7772336743. Note that the first 3 decimals coincide. The cubic root of 664390692 is about 872.5852077823.

The spelling of 664390692 in words is "six hundred sixty-four million, three hundred ninety thousand, six hundred ninety-two".