86491620 has 36 divisors (see below), whose sum is σ = 262358460. Its totient is φ = 23064384.

The previous prime is 86491589. The next prime is 86491637. The reversal of 86491620 is 2619468.

86491620 is a `hidden beast` number, since 8 + 649 + 1 + 6 + 2 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 35426304 + 51065316 = 5952^2 + 7146^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 in 11 ways as a sum of consecutive naturals, for example, 240075 + ... + 240434.

It is an arithmetic number, because the mean of its divisors is an integer number (7287735).

Almost surely, 2^86491620 is an apocalyptic number.

It is an amenable number.

86491620 is an abundant number, since it is smaller than the sum of its proper divisors (175866840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

86491620 is a wasteful number, since it uses less digits than its factorization.

86491620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480524 (or 480519 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 86491620 is about 9300.0870963664. The cubic root of 86491620 is about 442.2399889703.

The spelling of 86491620 in words is "eighty-six million, four hundred ninety-one thousand, six hundred twenty".