668672064 has 56 divisors (see below), whose sum is σ = 1965777120. Its totient is φ = 222890112.

The previous prime is 668672027. The next prime is 668672071. The reversal of 668672064 is 460276866.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191754 + ... + 195209.

Almost surely, 2^668672064 is an apocalyptic number.

668672064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

668672064 is an abundant number, since it is smaller than the sum of its proper divisors (1297105056).

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

668672064 is a wasteful number, since it uses less digits than its factorization.

668672064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386984 (or 386968 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The square root of 668672064 is about 25858.6941665661. The cubic root of 668672064 is about 874.4555258665.

The spelling of 668672064 in words is "six hundred sixty-eight million, six hundred seventy-two thousand, sixty-four".