68216664 has 16 divisors (see below), whose sum is σ = 170541720. Its totient is φ = 22738880.

The previous prime is 68216651. The next prime is 68216683. The reversal of 68216664 is 46661286.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1421157 + ... + 1421204.

Almost surely, 2^68216664 is an apocalyptic number.

It is an amenable number.

68216664 is an abundant number, since it is smaller than the sum of its proper divisors (102325056).

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

68216664 is a wasteful number, since it uses less digits than its factorization.

68216664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2842370 (or 2842366 counting only the distinct ones).

The product of its digits is 82944, while the sum is 39.

The square root of 68216664 is about 8259.3379879988. The cubic root of 68216664 is about 408.5985543748.

The spelling of 68216664 in words is "sixty-eight million, two hundred sixteen thousand, six hundred sixty-four".