87215655 has 32 divisors (see below), whose sum is σ = 147649536. Its totient is φ = 43870464.

The previous prime is 87215647. The next prime is 87215657. The reversal of 87215655 is 55651278.

It is not a de Polignac number, because 87215655 - 2³ = 87215647 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87215657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23454 + ... + 26916.

It is an arithmetic number, because the mean of its divisors is an integer number (4614048).

Almost surely, 2^87215655 is an apocalyptic number.

87215655 is a deficient number, since it is larger than the sum of its proper divisors (60433881).

87215655 is a wasteful number, since it uses less digits than its factorization.

87215655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3567.

The product of its digits is 84000, while the sum is 39.

The square root of 87215655 is about 9338.9322194778. The cubic root of 87215655 is about 443.4705817482.

The spelling of 87215655 in words is "eighty-seven million, two hundred fifteen thousand, six hundred fifty-five".