86878139 has 8 divisors (see below), whose sum is σ = 89652528. Its totient is φ = 84135040.

The previous prime is 86878097. The next prime is 86878157. The reversal of 86878139 is 93187868.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 86878139 - 2⁸ = 86877883 is a prime.

It is a super-2 number, since 2×86878139² = 15095622072206642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86878039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2117 + ... + 13350.

It is an arithmetic number, because the mean of its divisors is an integer number (11206566).

Almost surely, 2^86878139 is an apocalyptic number.

86878139 is a deficient number, since it is larger than the sum of its proper divisors (2774389).

86878139 is a wasteful number, since it uses less digits than its factorization.

86878139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15645.

The product of its digits is 580608, while the sum is 50.

The square root of 86878139 is about 9320.8443287076. The cubic root of 86878139 is about 442.8977797158.

The spelling of 86878139 in words is "eighty-six million, eight hundred seventy-eight thousand, one hundred thirty-nine".