67664768 has 16 divisors (see below), whose sum is σ = 134801160. Its totient is φ = 33832320.

The previous prime is 67664741. The next prime is 67664771. The reversal of 67664768 is 86746676.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 264188 + ... + 264443.

Almost surely, 2^67664768 is an apocalyptic number.

It is an amenable number.

67664768 is a deficient number, since it is larger than the sum of its proper divisors (67136392).

67664768 is an equidigital number, since it uses as much as digits as its factorization.

67664768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528645 (or 528633 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 50.

The square root of 67664768 is about 8225.8597119085. The cubic root of 67664768 is about 407.4936689646.

The spelling of 67664768 in words is "sixty-seven million, six hundred sixty-four thousand, seven hundred sixty-eight".