87015915 has 144 divisors (see below), whose sum is σ = 193489920. Its totient is φ = 35925120.

The previous prime is 87015913. The next prime is 87015919. The reversal of 87015915 is 51951078.

It is not a de Polignac number, because 87015915 - 2¹ = 87015913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87015915.

It is not an unprimeable number, because it can be changed into a prime (87015913) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1298712 + ... + 1298778.

It is an arithmetic number, because the mean of its divisors is an integer number (1343680).

Almost surely, 2^87015915 is an apocalyptic number.

87015915 is an abundant number, since it is smaller than the sum of its proper divisors (106474005).

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

87015915 is a wasteful number, since it uses less digits than its factorization.

87015915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 36.

The square root of 87015915 is about 9328.2321476258. The cubic root of 87015915 is about 443.1317797262.

It can be divided in two parts, 8701 and 5915, that multiplied together give a palindrome (51466415).

The spelling of 87015915 in words is "eighty-seven million, fifteen thousand, nine hundred fifteen".