87020865 has 16 divisors (see below), whose sum is σ = 154704000. Its totient is φ = 46411056.

The previous prime is 87020849. The next prime is 87020887. The reversal of 87020865 is 56802078.

It is not a de Polignac number, because 87020865 - 2⁴ = 87020849 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 322165 + ... + 322434.

It is an arithmetic number, because the mean of its divisors is an integer number (9669000).

Almost surely, 2^87020865 is an apocalyptic number.

It is an amenable number.

87020865 is a deficient number, since it is larger than the sum of its proper divisors (67683135).

87020865 is a wasteful number, since it uses less digits than its factorization.

87020865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644613 (or 644607 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 87020865 is about 9328.4974674382. The cubic root of 87020865 is about 443.1401822531.

The spelling of 87020865 in words is "eighty-seven million, twenty thousand, eight hundred sixty-five".