87815512 has 8 divisors (see below), whose sum is σ = 164654100. Its totient is φ = 43907752.

The previous prime is 87815501. The next prime is 87815513. The reversal of 87815512 is 21551878.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87815513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5488462 + ... + 5488477.

Almost surely, 2^87815512 is an apocalyptic number.

It is an amenable number.

87815512 is a deficient number, since it is larger than the sum of its proper divisors (76838588).

87815512 is a wasteful number, since it uses less digits than its factorization.

87815512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10976945 (or 10976941 counting only the distinct ones).

The product of its digits is 22400, while the sum is 37.

The square root of 87815512 is about 9370.9931170608. The cubic root of 87815512 is about 444.4849691011.

The spelling of 87815512 in words is "eighty-seven million, eight hundred fifteen thousand, five hundred twelve".