87990912 has 96 divisors (see below), whose sum is σ = 268156980. Its totient is φ = 27598848.

The previous prime is 87990869. The next prime is 87990913. The reversal of 87990912 is 21909978.

It can be written as a sum of positive squares in 2 ways, for example, as 66977856 + 21013056 = 8184^2 + 4584^2 .

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (87990913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17338 + ... + 21830.

Almost surely, 2^87990912 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 87990912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134078490).

87990912 is an abundant number, since it is smaller than the sum of its proper divisors (180166068).

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

87990912 is a wasteful number, since it uses less digits than its factorization.

87990912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4530 (or 4515 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 87990912 is about 9380.3471151125. The cubic root of 87990912 is about 444.7807058208.

The spelling of 87990912 in words is "eighty-seven million, nine hundred ninety thousand, nine hundred twelve".