87215651 has 8 divisors (see below), whose sum is σ = 89486208. Its totient is φ = 84952000.

The previous prime is 87215647. The next prime is 87215657. The reversal of 87215651 is 15651278.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87215651 - 2² = 87215647 is a prime.

It is a Duffinian number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32366 + ... + 34956.

It is an arithmetic number, because the mean of its divisors is an integer number (11185776).

Almost surely, 2^87215651 is an apocalyptic number.

87215651 is a deficient number, since it is larger than the sum of its proper divisors (2270557).

87215651 is a wasteful number, since it uses less digits than its factorization.

87215651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3453.

The product of its digits is 16800, while the sum is 35.

The square root of 87215651 is about 9338.9320053205. The cubic root of 87215651 is about 443.4705749685.

The spelling of 87215651 in words is "eighty-seven million, two hundred fifteen thousand, six hundred fifty-one".