78889855 has 16 divisors (see below), whose sum is σ = 103562784. Its totient is φ = 57214080.

The previous prime is 78889849. The next prime is 78889879. The reversal of 78889855 is 55898887.

It is not a de Polignac number, because 78889855 - 2³ = 78889847 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78889855.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 20029 + ... + 23641.

It is an arithmetic number, because the mean of its divisors is an integer number (6472674).

Almost surely, 2^78889855 is an apocalyptic number.

78889855 is a deficient number, since it is larger than the sum of its proper divisors (24672929).

78889855 is a wasteful number, since it uses less digits than its factorization.

78889855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4026.

The product of its digits is 6451200, while the sum is 58.

The square root of 78889855 is about 8881.9961157388. The cubic root of 78889855 is about 428.8845345021.

The spelling of 78889855 in words is "seventy-eight million, eight hundred eighty-nine thousand, eight hundred fifty-five".