86644523 has 4 divisors (see below), whose sum is σ = 99022320. Its totient is φ = 74266728.

The previous prime is 86644517. The next prime is 86644531. The reversal of 86644523 is 32544668.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 86644523 - 2⁴ = 86644507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86644553) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6188888 + ... + 6188901.

It is an arithmetic number, because the mean of its divisors is an integer number (24755580).

Almost surely, 2^86644523 is an apocalyptic number.

86644523 is a deficient number, since it is larger than the sum of its proper divisors (12377797).

86644523 is a wasteful number, since it uses less digits than its factorization.

86644523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12377796.

The product of its digits is 138240, while the sum is 38.

The square root of 86644523 is about 9308.3039808549. The cubic root of 86644523 is about 442.5004381453.

The spelling of 86644523 in words is "eighty-six million, six hundred forty-four thousand, five hundred twenty-three".