91989056 has 14 divisors (see below), whose sum is σ = 182540910. Its totient is φ = 45994496.

The previous prime is 91989019. The next prime is 91989103. The reversal of 91989056 is 65098919.

It can be written as a sum of positive squares in only one way, i.e., 70829056 + 21160000 = 8416^2 + 4600^2 .

It is a super-2 number, since 2×91989056² = 16923972847542272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91989056.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 718601 + ... + 718728.

Almost surely, 2^91989056 is an apocalyptic number.

It is an amenable number.

91989056 is a deficient number, since it is larger than the sum of its proper divisors (90551854).

91989056 is a wasteful number, since it uses less digits than its factorization.

91989056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437341 (or 1437331 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 91989056 is about 9591.0925342215. The cubic root of 91989056 is about 451.4178424289.

The spelling of 91989056 in words is "ninety-one million, nine hundred eighty-nine thousand, fifty-six".