668732480 has 56 divisors (see below), whose sum is σ = 1714923672. Its totient is φ = 246915072.

The previous prime is 668732479. The next prime is 668732503. The reversal of 668732480 is 84237866.

It can be written as a sum of positive squares in 4 ways, for example, as 6390784 + 662341696 = 2528^2 + 25736^2 .

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, 76217 + ... + 84536.

It is an arithmetic number, because the mean of its divisors is an integer number (30623637).

Almost surely, 2^668732480 is an apocalyptic number.

It is an amenable number.

668732480 is an abundant number, since it is smaller than the sum of its proper divisors (1046191192).

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

668732480 is a wasteful number, since it uses less digits than its factorization.

668732480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160783 (or 160773 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 44.

The square root of 668732480 is about 25859.8623352871. The cubic root of 668732480 is about 874.4818614037.

The spelling of 668732480 in words is "six hundred sixty-eight million, seven hundred thirty-two thousand, four hundred eighty".