690440664 has 16 divisors (see below), whose sum is σ = 1726101720. Its totient is φ = 230146880.

The previous prime is 690440633. The next prime is 690440693. The reversal of 690440664 is 466044096.

It is a congruent number.

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, 14384157 + ... + 14384204.

Almost surely, 2^690440664 is an apocalyptic number.

It is an amenable number.

690440664 is an abundant number, since it is smaller than the sum of its proper divisors (1035661056).

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

690440664 is a wasteful number, since it uses less digits than its factorization.

690440664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28768370 (or 28768366 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 690440664 is about 26276.2376302240. The cubic root of 690440664 is about 883.8436658357.

The spelling of 690440664 in words is "six hundred ninety million, four hundred forty thousand, six hundred sixty-four".