91663632 has 30 divisors (see below), whose sum is σ = 256531262. Its totient is φ = 30554496.

The previous prime is 91663603. The next prime is 91663667. The reversal of 91663632 is 23636619.

91663632 is a `hidden beast` number, since 9 + 16 + 6 + 3 + 632 = 666.

It can be written as a sum of positive squares in only one way, i.e., 82519056 + 9144576 = 9084^2 + 3024^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 318133 + ... + 318420.

Almost surely, 2^91663632 is an apocalyptic number.

It is an amenable number.

91663632 is an abundant number, since it is smaller than the sum of its proper divisors (164867630).

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

91663632 is a wasteful number, since it uses less digits than its factorization.

91663632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636567 (or 636558 counting only the distinct ones).

The product of its digits is 34992, while the sum is 36.

The square root of 91663632 is about 9574.1125959537. The cubic root of 91663632 is about 450.8848958063.

The spelling of 91663632 in words is "ninety-one million, six hundred sixty-three thousand, six hundred thirty-two".