86591978 has 8 divisors (see below), whose sum is σ = 141696000. Its totient is φ = 39359980.

The previous prime is 86591977. The next prime is 86592053. The reversal of 86591978 is 87919568.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (86591971) 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, 1967978 + ... + 1968021.

It is an arithmetic number, because the mean of its divisors is an integer number (17712000).

Almost surely, 2^86591978 is an apocalyptic number.

86591978 is a deficient number, since it is larger than the sum of its proper divisors (55104022).

86591978 is a wasteful number, since it uses less digits than its factorization.

86591978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3936012.

The product of its digits is 1088640, while the sum is 53.

The square root of 86591978 is about 9305.4810730021. The cubic root of 86591978 is about 442.4109695654.

The spelling of 86591978 in words is "eighty-six million, five hundred ninety-one thousand, nine hundred seventy-eight".