78866655 has 96 divisors (see below), whose sum is σ = 161270784. Its totient is φ = 32169984.

The previous prime is 78866639. The next prime is 78866677. The reversal of 78866655 is 55666887.

It is not a de Polignac number, because 78866655 - 2⁴ = 78866639 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

Its product of digits (2419200) is a multiple of the sum of its prime divisors (168).

It is a junction number, because it is equal to n+sod(n) for n = 78866598 and 78866607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 697879 + ... + 697991.

It is an arithmetic number, because the mean of its divisors is an integer number (1679904).

Almost surely, 2^78866655 is an apocalyptic number.

78866655 is an abundant number, since it is smaller than the sum of its proper divisors (82404129).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78866655 is a wasteful number, since it uses less digits than its factorization.

78866655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185 (or 168 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 51.

The square root of 78866655 is about 8880.6900069758. The cubic root of 78866655 is about 428.8424881294.

It can be divided in two parts, 7886 and 6655, that added together give a palindrome (14541).

The spelling of 78866655 in words is "seventy-eight million, eight hundred sixty-six thousand, six hundred fifty-five".