91989456 has 40 divisors (see below), whose sum is σ = 255921120. Its totient is φ = 28304256.

The previous prime is 91989413. The next prime is 91989461. The reversal of 91989456 is 65498919.

It is a junction number, because it is equal to n+sod(n) for n = 91989399 and 91989408.

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, 73086 + ... + 74333.

It is an arithmetic number, because the mean of its divisors is an integer number (6398028).

Almost surely, 2^91989456 is an apocalyptic number.

It is an amenable number.

91989456 is an abundant number, since it is smaller than the sum of its proper divisors (163931664).

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

91989456 is a wasteful number, since it uses less digits than its factorization.

91989456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147443 (or 147437 counting only the distinct ones).

The product of its digits is 699840, while the sum is 51.

The square root of 91989456 is about 9591.1133868806. The cubic root of 91989456 is about 451.4184967346.

The spelling of 91989456 in words is "ninety-one million, nine hundred eighty-nine thousand, four hundred fifty-six".