78774878 has 32 divisors (see below), whose sum is σ = 146119680. Its totient is φ = 31016160.

The previous prime is 78774847. The next prime is 78774881. The reversal of 78774878 is 87847787.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42593 + ... + 44403.

It is an arithmetic number, because the mean of its divisors is an integer number (4566240).

Almost surely, 2^78774878 is an apocalyptic number.

78774878 is a deficient number, since it is larger than the sum of its proper divisors (67344802).

78774878 is a wasteful number, since it uses less digits than its factorization.

78774878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2072.

The product of its digits is 4917248, while the sum is 56.

The square root of 78774878 is about 8875.5212804657. The cubic root of 78774878 is about 428.6760757894.

The spelling of 78774878 in words is "seventy-eight million, seven hundred seventy-four thousand, eight hundred seventy-eight".