78609855 has 16 divisors (see below), whose sum is σ = 125977824. Its totient is φ = 41857920.

The previous prime is 78609841. The next prime is 78609857. The reversal of 78609855 is 55890687.

It is not a de Polignac number, because 78609855 - 2⁸ = 78609599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78609857) 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, 6285 + ... + 14025.

It is an arithmetic number, because the mean of its divisors is an integer number (7873614).

Almost surely, 2^78609855 is an apocalyptic number.

78609855 is a deficient number, since it is larger than the sum of its proper divisors (47367969).

78609855 is a wasteful number, since it uses less digits than its factorization.

78609855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8426.

The product of its (nonzero) digits is 604800, while the sum is 48.

The square root of 78609855 is about 8866.2198822271. The cubic root of 78609855 is about 428.3765265363.

The spelling of 78609855 in words is "seventy-eight million, six hundred nine thousand, eight hundred fifty-five".