87561315 has 24 divisors (see below), whose sum is σ = 153485280. Its totient is φ = 46172544.

The previous prime is 87561311. The next prime is 87561319. The reversal of 87561315 is 51316578.

87561315 is a `hidden beast` number, since 87 + 561 + 3 + 15 = 666.

It is an interprime number because it is at equal distance from previous prime (87561311) and next prime (87561319).

It is not a de Polignac number, because 87561315 - 2² = 87561311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87561315.

It is not an unprimeable number, because it can be changed into a prime (87561311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6927 + ... + 14936.

It is an arithmetic number, because the mean of its divisors is an integer number (6395220).

Almost surely, 2^87561315 is an apocalyptic number.

87561315 is a deficient number, since it is larger than the sum of its proper divisors (65923965).

87561315 is a wasteful number, since it uses less digits than its factorization.

87561315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21963 (or 21960 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 87561315 is about 9357.4203175875. The cubic root of 87561315 is about 444.0556753899.

The spelling of 87561315 in words is "eighty-seven million, five hundred sixty-one thousand, three hundred fifteen".