91086664 has 16 divisors (see below), whose sum is σ = 173588220. Its totient is φ = 44796480.

The previous prime is 91086661. The next prime is 91086683. The reversal of 91086664 is 46668019.

It can be written as a sum of positive squares in 2 ways, for example, as 74684164 + 16402500 = 8642^2 + 4050^2 .

It is not an unprimeable number, because it can be changed into a prime (91086661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92839 + ... + 93814.

Almost surely, 2^91086664 is an apocalyptic number.

It is an amenable number.

91086664 is a deficient number, since it is larger than the sum of its proper divisors (82501556).

91086664 is a wasteful number, since it uses less digits than its factorization.

91086664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186720 (or 186716 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 91086664 is about 9543.9333610415. The cubic root of 91086664 is about 449.9368866219.

The spelling of 91086664 in words is "ninety-one million, eighty-six thousand, six hundred sixty-four".