91566636 has 48 divisors (see below), whose sum is σ = 245253120. Its totient is φ = 26046720.

The previous prime is 91566617. The next prime is 91566637. The reversal of 91566636 is 63666519.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (91566637) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 17796 + ... + 22356.

It is an arithmetic number, because the mean of its divisors is an integer number (5109440).

Almost surely, 2^91566636 is an apocalyptic number.

It is an amenable number.

91566636 is an abundant number, since it is smaller than the sum of its proper divisors (153686484).

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

91566636 is a wasteful number, since it uses less digits than its factorization.

91566636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4814 (or 4812 counting only the distinct ones).

The product of its digits is 174960, while the sum is 42.

The square root of 91566636 is about 9569.0457204467. The cubic root of 91566636 is about 450.7258015703.

The spelling of 91566636 in words is "ninety-one million, five hundred sixty-six thousand, six hundred thirty-six".