87121508 has 6 divisors (see below), whose sum is σ = 152462646. Its totient is φ = 43560752.

The previous prime is 87121487. The next prime is 87121513. The reversal of 87121508 is 80512178.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 59474944 + 27646564 = 7712^2 + 5258^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 10890185 + ... + 10890192.

It is an arithmetic number, because the mean of its divisors is an integer number (25410441).

Almost surely, 2^87121508 is an apocalyptic number.

It is an amenable number.

87121508 is a deficient number, since it is larger than the sum of its proper divisors (65341138).

87121508 is a wasteful number, since it uses less digits than its factorization.

87121508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21780381 (or 21780379 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 87121508 is about 9333.8902929057. The cubic root of 87121508 is about 443.3109526959.

The spelling of 87121508 in words is "eighty-seven million, one hundred twenty-one thousand, five hundred eight".