668605464 has 48 divisors (see below), whose sum is σ = 1841509800. Its totient is φ = 219089664.

The previous prime is 668605453. The next prime is 668605471. The reversal of 668605464 is 464506866.

It is a congruent number.

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, 74449 + ... + 82944.

Almost surely, 2^668605464 is an apocalyptic number.

It is an amenable number.

668605464 is an abundant number, since it is smaller than the sum of its proper divisors (1172904336).

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

668605464 is a wasteful number, since it uses less digits than its factorization.

668605464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157464 (or 157457 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The square root of 668605464 is about 25857.4063664552. The cubic root of 668605464 is about 874.4264928648.

The spelling of 668605464 in words is "six hundred sixty-eight million, six hundred five thousand, four hundred sixty-four".