87815712 has 48 divisors (see below), whose sum is σ = 238472640. Its totient is φ = 28261632.

The previous prime is 87815699. The next prime is 87815713. The reversal of 87815712 is 21751878.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (87815713) 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, 12988 + ... + 18555.

It is an arithmetic number, because the mean of its divisors is an integer number (4968180).

Almost surely, 2^87815712 is an apocalyptic number.

It is an amenable number.

87815712 is an abundant number, since it is smaller than the sum of its proper divisors (150656928).

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

87815712 is a wasteful number, since it uses less digits than its factorization.

87815712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31585 (or 31577 counting only the distinct ones).

The product of its digits is 31360, while the sum is 39.

The square root of 87815712 is about 9371.0037882822. The cubic root of 87815712 is about 444.4853065393.

The spelling of 87815712 in words is "eighty-seven million, eight hundred fifteen thousand, seven hundred twelve".