78816886 has 12 divisors (see below), whose sum is σ = 118918908. Its totient is φ = 39178272.

The previous prime is 78816877. The next prime is 78816889. The reversal of 78816886 is 68861887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78816889) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 226965 + ... + 227311.

It is an arithmetic number, because the mean of its divisors is an integer number (9909909).

Almost surely, 2^78816886 is an apocalyptic number.

78816886 is a deficient number, since it is larger than the sum of its proper divisors (40102022).

78816886 is an equidigital number, since it uses as much as digits as its factorization.

78816886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023 (or 686 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 52.

The square root of 78816886 is about 8877.8874739433. The cubic root of 78816886 is about 428.7522617724.

The spelling of 78816886 in words is "seventy-eight million, eight hundred sixteen thousand, eight hundred eighty-six".