78818955 has 16 divisors (see below), whose sum is σ = 130459680. Its totient is φ = 40587008.

The previous prime is 78818951. The next prime is 78818959. The reversal of 78818955 is 55981887.

It is an interprime number because it is at equal distance from previous prime (78818951) and next prime (78818959).

It is not a de Polignac number, because 78818955 - 2² = 78818951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78818898 and 78818907.

It is not an unprimeable number, because it can be changed into a prime (78818951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90162 + ... + 91031.

It is an arithmetic number, because the mean of its divisors is an integer number (8153730).

Almost surely, 2^78818955 is an apocalyptic number.

78818955 is a deficient number, since it is larger than the sum of its proper divisors (51640725).

78818955 is a wasteful number, since it uses less digits than its factorization.

78818955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181230.

The product of its digits is 806400, while the sum is 51.

The square root of 78818955 is about 8878.0039986474. The cubic root of 78818955 is about 428.7560134248.

It can be divided in two parts, 7881 and 8955, that added together give a triangular number (16836 = T₁₈₃).

The spelling of 78818955 in words is "seventy-eight million, eight hundred eighteen thousand, nine hundred fifty-five".