668033408 has 32 divisors (see below), whose sum is σ = 1520970960. Its totient is φ = 286299648.

The previous prime is 668033381. The next prime is 668033489. The reversal of 668033408 is 804330866.

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

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, 371891 + ... + 373682.

Almost surely, 2^668033408 is an apocalyptic number.

It is an amenable number.

668033408 is an abundant number, since it is smaller than the sum of its proper divisors (852937552).

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

668033408 is an equidigital number, since it uses as much as digits as its factorization.

668033408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745594 (or 745582 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 668033408 is about 25846.3422557235. The cubic root of 668033408 is about 874.1770365068.

The spelling of 668033408 in words is "six hundred sixty-eight million, thirty-three thousand, four hundred eight".