78612878 has 4 divisors (see below), whose sum is σ = 117919320. Its totient is φ = 39306438.

The previous prime is 78612851. The next prime is 78612887. The reversal of 78612878 is 87821687.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19653218 + ... + 19653221.

It is an arithmetic number, because the mean of its divisors is an integer number (29479830).

Almost surely, 2^78612878 is an apocalyptic number.

78612878 is a deficient number, since it is larger than the sum of its proper divisors (39306442).

78612878 is a wasteful number, since it uses less digits than its factorization.

78612878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39306441.

The product of its digits is 301056, while the sum is 47.

The square root of 78612878 is about 8866.3903591033. The cubic root of 78612878 is about 428.3820176444.

The spelling of 78612878 in words is "seventy-eight million, six hundred twelve thousand, eight hundred seventy-eight".