89811440 has 20 divisors (see below), whose sum is σ = 208811784. Its totient is φ = 35924544.

The previous prime is 89811401. The next prime is 89811451. The reversal of 89811440 is 4411898.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 89811440.

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, 561242 + ... + 561401.

Almost surely, 2^89811440 is an apocalyptic number.

89811440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

89811440 is an abundant number, since it is smaller than the sum of its proper divisors (119000344).

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

89811440 is a wasteful number, since it uses less digits than its factorization.

89811440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122656 (or 1122650 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 89811440 is about 9476.8897851563. The cubic root of 89811440 is about 447.8272878041.

The spelling of 89811440 in words is "eighty-nine million, eight hundred eleven thousand, four hundred forty".