86990985 has 12 divisors (see below), whose sum is σ = 150784452. Its totient is φ = 46395168.

The previous prime is 86990977. The next prime is 86991007. The reversal of 86990985 is 58909968.

It can be written as a sum of positive squares in 2 ways, for example, as 10673289 + 76317696 = 3267^2 + 8736^2 .

It is not a de Polignac number, because 86990985 - 2³ = 86990977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 966522 + ... + 966611.

It is an arithmetic number, because the mean of its divisors is an integer number (12565371).

Almost surely, 2^86990985 is an apocalyptic number.

It is an amenable number.

86990985 is a deficient number, since it is larger than the sum of its proper divisors (63793467).

86990985 is a wasteful number, since it uses less digits than its factorization.

86990985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1933144 (or 1933141 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The square root of 86990985 is about 9326.8957858443. The cubic root of 86990985 is about 443.0894567003.

The spelling of 86990985 in words is "eighty-six million, nine hundred ninety thousand, nine hundred eighty-five".