91766720 has 28 divisors (see below), whose sum is σ = 218520264. Its totient is φ = 36706560.

The previous prime is 91766699. The next prime is 91766791. The reversal of 91766720 is 2766719.

It is a super-2 number, since 2×91766720² = 16842261799116800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143066 + ... + 143705.

Almost surely, 2^91766720 is an apocalyptic number.

It is an amenable number.

91766720 is an abundant number, since it is smaller than the sum of its proper divisors (126753544).

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

91766720 is a wasteful number, since it uses less digits than its factorization.

91766720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286788 (or 286778 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 91766720 is about 9579.4947674708. The cubic root of 91766720 is about 451.0538592485.

The spelling of 91766720 in words is "ninety-one million, seven hundred sixty-six thousand, seven hundred twenty".