87815812 has 24 divisors (see below), whose sum is σ = 185963904. Its totient is φ = 35421312.

The previous prime is 87815807. The next prime is 87815813. The reversal of 87815812 is 21851878.

It is not an unprimeable number, because it can be changed into a prime (87815813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91768 + ... + 92719.

It is an arithmetic number, because the mean of its divisors is an integer number (7748496).

Almost surely, 2^87815812 is an apocalyptic number.

It is an amenable number.

87815812 is an abundant number, since it is smaller than the sum of its proper divisors (98148092).

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

87815812 is a wasteful number, since it uses less digits than its factorization.

87815812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184515 (or 184513 counting only the distinct ones).

The product of its digits is 35840, while the sum is 40.

The square root of 87815812 is about 9371.0091238884. The cubic root of 87815812 is about 444.4854752582.

The spelling of 87815812 in words is "eighty-seven million, eight hundred fifteen thousand, eight hundred twelve".