89999640 has 128 divisors (see below), whose sum is σ = 302400000. Its totient is φ = 23808384.

The previous prime is 89999597. The next prime is 89999653. The reversal of 89999640 is 4699998.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 180111 + ... + 180609.

It is an arithmetic number, because the mean of its divisors is an integer number (2362500).

Almost surely, 2^89999640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 89999640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151200000).

89999640 is an abundant number, since it is smaller than the sum of its proper divisors (212400360).

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

89999640 is a wasteful number, since it uses less digits than its factorization.

89999640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686 (or 676 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The square root of 89999640 is about 9486.8140068202. The cubic root of 89999640 is about 448.1398771343.

The spelling of 89999640 in words is "eighty-nine million, nine hundred ninety-nine thousand, six hundred forty".