86505172 has 24 divisors (see below), whose sum is σ = 163688616. Its totient is φ = 39763968.

The previous prime is 86505131. The next prime is 86505191. The reversal of 86505172 is 27150568.

It can be written as a sum of positive squares in 4 ways, for example, as 10536516 + 75968656 = 3246^2 + 8716^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10128 + ... + 16600.

It is an arithmetic number, because the mean of its divisors is an integer number (6820359).

Almost surely, 2^86505172 is an apocalyptic number.

It is an amenable number.

86505172 is a deficient number, since it is larger than the sum of its proper divisors (77183444).

86505172 is a wasteful number, since it uses less digits than its factorization.

86505172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6747 (or 6745 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 86505172 is about 9300.8156631556. The cubic root of 86505172 is about 442.2630853248.

The spelling of 86505172 in words is "eighty-six million, five hundred five thousand, one hundred seventy-two".