87561515 has 12 divisors (see below), whose sum is σ = 108578592. Its totient is φ = 67785840.

The previous prime is 87561497. The next prime is 87561581. The reversal of 87561515 is 51516578.

It is a happy number.

It is not a de Polignac number, because 87561515 - 2⁶ = 87561451 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4307 + ... + 13916.

It is an arithmetic number, because the mean of its divisors is an integer number (9048216).

Almost surely, 2^87561515 is an apocalyptic number.

87561515 is a deficient number, since it is larger than the sum of its proper divisors (21017077).

87561515 is a wasteful number, since it uses less digits than its factorization.

87561515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18290 (or 18259 counting only the distinct ones).

The product of its digits is 42000, while the sum is 38.

The square root of 87561515 is about 9357.4310042874. The cubic root of 87561515 is about 444.0560134808.

The spelling of 87561515 in words is "eighty-seven million, five hundred sixty-one thousand, five hundred fifteen".