87115812 has 96 divisors (see below), whose sum is σ = 246392832. Its totient is φ = 23417856.

The previous prime is 87115799. The next prime is 87115813. The reversal of 87115812 is 21851178.

It is not an unprimeable number, because it can be changed into a prime (87115813) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129108 + ... + 129780.

It is an arithmetic number, because the mean of its divisors is an integer number (2566592).

Almost surely, 2^87115812 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 87115812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123196416).

87115812 is an abundant number, since it is smaller than the sum of its proper divisors (159277020).

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

87115812 is a wasteful number, since it uses less digits than its factorization.

87115812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777 (or 775 counting only the distinct ones).

The product of its digits is 4480, while the sum is 33.

The square root of 87115812 is about 9333.5851632693. The cubic root of 87115812 is about 443.3012912690.

The spelling of 87115812 in words is "eighty-seven million, one hundred fifteen thousand, eight hundred twelve".