87215157 has 32 divisors (see below), whose sum is σ = 134006400. Its totient is φ = 56025216.

The previous prime is 87215153. The next prime is 87215171. The reversal of 87215157 is 75151278.

It is not a de Polignac number, because 87215157 - 2² = 87215153 is a prime.

It is a super-2 number, since 2×87215157² = 15212967221069298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87215153) 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 31 ways as a sum of consecutive naturals, for example, 83913 + ... + 84945.

It is an arithmetic number, because the mean of its divisors is an integer number (4187700).

Almost surely, 2^87215157 is an apocalyptic number.

It is an amenable number.

87215157 is a deficient number, since it is larger than the sum of its proper divisors (46791243).

87215157 is a wasteful number, since it uses less digits than its factorization.

87215157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154 (or 1148 counting only the distinct ones).

The product of its digits is 19600, while the sum is 36.

The square root of 87215157 is about 9338.9055568626. The cubic root of 87215157 is about 443.4697376766.

The spelling of 87215157 in words is "eighty-seven million, two hundred fifteen thousand, one hundred fifty-seven".