89437840 has 20 divisors (see below), whose sum is σ = 207943164. Its totient is φ = 35775104.

The previous prime is 89437819. The next prime is 89437841. The reversal of 89437840 is 4873498.

It can be written as a sum of positive squares in 2 ways, for example, as 33547264 + 55890576 = 5792^2 + 7476^2 .

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

It is not an unprimeable number, because it can be changed into a prime (89437841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 558907 + ... + 559066.

Almost surely, 2^89437840 is an apocalyptic number.

89437840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

89437840 is an abundant number, since it is smaller than the sum of its proper divisors (118505324).

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

89437840 is a wasteful number, since it uses less digits than its factorization.

89437840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117986 (or 1117980 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 89437840 is about 9457.1581355077. The cubic root of 89437840 is about 447.2054635188.

The spelling of 89437840 in words is "eighty-nine million, four hundred thirty-seven thousand, eight hundred forty".