86879978 has 16 divisors (see below), whose sum is σ = 133371360. Its totient is φ = 42432336.

The previous prime is 86879971. The next prime is 86879983. The reversal of 86879978 is 87997868.

It is a self number, because there is not a number n which added to its sum of digits gives 86879978.

It is not an unprimeable number, because it can be changed into a prime (86879971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16976 + ... + 21492.

It is an arithmetic number, because the mean of its divisors is an integer number (8335710).

Almost surely, 2^86879978 is an apocalyptic number.

86879978 is a deficient number, since it is larger than the sum of its proper divisors (46491382).

86879978 is a wasteful number, since it uses less digits than its factorization.

86879978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4741.

The product of its digits is 12192768, while the sum is 62.

The square root of 86879978 is about 9320.9429780468. The cubic root of 86879978 is about 442.9009047186.

The spelling of 86879978 in words is "eighty-six million, eight hundred seventy-nine thousand, nine hundred seventy-eight".