668147408 has 20 divisors (see below), whose sum is σ = 1295625408. Its totient is φ = 333792480.

The previous prime is 668147387. The next prime is 668147423. The reversal of 668147408 is 804741866.

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, 2735 + ... + 36657.

Almost surely, 2^668147408 is an apocalyptic number.

It is an amenable number.

668147408 is a deficient number, since it is larger than the sum of its proper divisors (627478000).

668147408 is a wasteful number, since it uses less digits than its factorization.

668147408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35162 (or 35156 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 44.

The square root of 668147408 is about 25848.5475027128. The cubic root of 668147408 is about 874.2267598254.

The spelling of 668147408 in words is "six hundred sixty-eight million, one hundred forty-seven thousand, four hundred eight".