91996566 has 16 divisors (see below), whose sum is σ = 184089024. Its totient is φ = 30649544.

The previous prime is 91996559. The next prime is 91996603. The reversal of 91996566 is 66569919.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16825 + ... + 21611.

It is an arithmetic number, because the mean of its divisors is an integer number (11505564).

Almost surely, 2^91996566 is an apocalyptic number.

91996566 is an abundant number, since it is smaller than the sum of its proper divisors (92092458).

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

91996566 is a wasteful number, since it uses less digits than its factorization.

91996566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7995.

The product of its digits is 787320, while the sum is 51.

The square root of 91996566 is about 9591.4840353305. The cubic root of 91996566 is about 451.4301267009.

The spelling of 91996566 in words is "ninety-one million, nine hundred ninety-six thousand, five hundred sixty-six".