668067072 has 36 divisors (see below), whose sum is σ = 1778034720. Its totient is φ = 222688768.

The previous prime is 668067061. The next prime is 668067097. The reversal of 668067072 is 270760866.

It is a super-2 number, since 2×668067072² = 892627225381306368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434172 + ... + 435707.

Almost surely, 2^668067072 is an apocalyptic number.

It is an amenable number.

668067072 is an abundant number, since it is smaller than the sum of its proper divisors (1109967648).

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

668067072 is an equidigital number, since it uses as much as digits as its factorization.

668067072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869898 (or 869884 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 668067072 is about 25846.9934808674. The cubic root of 668067072 is about 874.1917203041.

The spelling of 668067072 in words is "six hundred sixty-eight million, sixty-seven thousand, seventy-two".