86878919 has 2 divisors, whose sum is σ = 86878920. Its totient is φ = 86878918.

The previous prime is 86878879. The next prime is 86878949. The reversal of 86878919 is 91987868.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86878919 is a prime.

It is a super-2 number, since 2×86878919² = 15095893133217122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86878949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43439459 + 43439460.

It is an arithmetic number, because the mean of its divisors is an integer number (43439460).

Almost surely, 2^86878919 is an apocalyptic number.

86878919 is a deficient number, since it is larger than the sum of its proper divisors (1).

86878919 is an equidigital number, since it uses as much as digits as its factorization.

86878919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 56.

The square root of 86878919 is about 9320.8861703166. The cubic root of 86878919 is about 442.8991051710.

The spelling of 86878919 in words is "eighty-six million, eight hundred seventy-eight thousand, nine hundred nineteen".