89991040 has 32 divisors (see below), whose sum is σ = 215136360. Its totient is φ = 35996160.

The previous prime is 89991037. The next prime is 89991059. The reversal of 89991040 is 4019998.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 89990984 and 89991002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69666 + ... + 70945.

Almost surely, 2^89991040 is an apocalyptic number.

89991040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

89991040 is an abundant number, since it is smaller than the sum of its proper divisors (125145320).

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

89991040 is a wasteful number, since it uses less digits than its factorization.

89991040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140630 (or 140618 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 89991040 is about 9486.3607352873. The cubic root of 89991040 is about 448.1256025375.

The spelling of 89991040 in words is "eighty-nine million, nine hundred ninety-one thousand, forty".