86721885 has 24 divisors (see below), whose sum is σ = 152440704. Its totient is φ = 45598560.

The previous prime is 86721881. The next prime is 86721907. The reversal of 86721885 is 58812768.

It is not a de Polignac number, because 86721885 - 2² = 86721881 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 86721885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86721881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10377 + ... + 16766.

It is an arithmetic number, because the mean of its divisors is an integer number (6351696).

Almost surely, 2^86721885 is an apocalyptic number.

It is an amenable number.

86721885 is a deficient number, since it is larger than the sum of its proper divisors (65718819).

86721885 is a wasteful number, since it uses less digits than its factorization.

86721885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27225 (or 27222 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 86721885 is about 9312.4585905120. The cubic root of 86721885 is about 442.6320969212.

The spelling of 86721885 in words is "eighty-six million, seven hundred twenty-one thousand, eight hundred eighty-five".