87965521 has 16 divisors (see below), whose sum is σ = 102435840. Its totient is φ = 73982160.

The previous prime is 87965491. The next prime is 87965533. The reversal of 87965521 is 12556978.

It is not a de Polignac number, because 87965521 - 2⁵ = 87965489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87965561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188130 + ... + 188596.

It is an arithmetic number, because the mean of its divisors is an integer number (6402240).

Almost surely, 2^87965521 is an apocalyptic number.

It is an amenable number.

87965521 is a deficient number, since it is larger than the sum of its proper divisors (14470319).

87965521 is a wasteful number, since it uses less digits than its factorization.

87965521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924.

The product of its digits is 151200, while the sum is 43.

The square root of 87965521 is about 9378.9936027273. The cubic root of 87965521 is about 444.7379191545.

The spelling of 87965521 in words is "eighty-seven million, nine hundred sixty-five thousand, five hundred twenty-one".