89171920 has 40 divisors (see below), whose sum is σ = 216343296. Its totient is φ = 34117248.

The previous prime is 89171911. The next prime is 89171933. The reversal of 89171920 is 2917198.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 89171920.

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, 22392 + ... + 26071.

Almost surely, 2^89171920 is an apocalyptic number.

89171920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

89171920 is an abundant number, since it is smaller than the sum of its proper divisors (127171376).

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

89171920 is a wasteful number, since it uses less digits than its factorization.

89171920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48499 (or 48493 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 89171920 is about 9443.0884778233. The cubic root of 89171920 is about 446.7618074110.

The spelling of 89171920 in words is "eighty-nine million, one hundred seventy-one thousand, nine hundred twenty".