86578973 has 4 divisors (see below), whose sum is σ = 93238908. Its totient is φ = 79919040.

The previous prime is 86578967. The next prime is 86578981. The reversal of 86578973 is 37987568.

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

It can be written as a sum of positive squares in 2 ways, for example, as 34421689 + 52157284 = 5867^2 + 7222^2 .

It is a cyclic number.

It is not a de Polignac number, because 86578973 - 2⁴ = 86578957 is a prime.

It is a super-3 number, since 3×86578973³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86578903) 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, 3329948 + ... + 3329973.

It is an arithmetic number, because the mean of its divisors is an integer number (23309727).

Almost surely, 2^86578973 is an apocalyptic number.

It is an amenable number.

86578973 is a deficient number, since it is larger than the sum of its proper divisors (6659935).

86578973 is a wasteful number, since it uses less digits than its factorization.

86578973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6659934.

The product of its digits is 2540160, while the sum is 53.

The square root of 86578973 is about 9304.7822650506. The cubic root of 86578973 is about 442.3888203130.

The spelling of 86578973 in words is "eighty-six million, five hundred seventy-eight thousand, nine hundred seventy-three".