668691584 has 32 divisors (see below), whose sum is σ = 1453267440. Its totient is φ = 303950080.

The previous prime is 668691559. The next prime is 668691601. The reversal of 668691584 is 485196866.

668691584 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (32).

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, 236054 + ... + 238869.

Almost surely, 2^668691584 is an apocalyptic number.

668691584 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

668691584 is an abundant number, since it is smaller than the sum of its proper divisors (784575856).

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

668691584 is a wasteful number, since it uses less digits than its factorization.

668691584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474948 (or 474936 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 53.

The square root of 668691584 is about 25859.0715997307. The cubic root of 668691584 is about 874.4640348735.

The spelling of 668691584 in words is "six hundred sixty-eight million, six hundred ninety-one thousand, five hundred eighty-four".