91972866 has 8 divisors (see below), whose sum is σ = 183945744. Its totient is φ = 30657620.

The previous prime is 91972849. The next prime is 91972871. The reversal of 91972866 is 66827919.

It is a sphenic number, since it is the product of 3 distinct primes.

91972866 is an admirable number.

It is a super-3 number, since 3×91972866³ (a number of 25 digits) contains 333 as substring.

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 3 ways as a sum of consecutive naturals, for example, 7664400 + ... + 7664411.

It is an arithmetic number, because the mean of its divisors is an integer number (22993218).

Almost surely, 2^91972866 is an apocalyptic number.

91972866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

91972866 is a wasteful number, since it uses less digits than its factorization.

91972866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15328816.

The product of its digits is 326592, while the sum is 48.

The square root of 91972866 is about 9590.2484847891. The cubic root of 91972866 is about 451.3913578159.

The spelling of 91972866 in words is "ninety-one million, nine hundred seventy-two thousand, eight hundred sixty-six".