78611878 has 8 divisors (see below), whose sum is σ = 117961272. Its totient is φ = 39291456.

The previous prime is 78611821. The next prime is 78611881. The reversal of 78611878 is 87811687.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1801 + ... + 12667.

It is an arithmetic number, because the mean of its divisors is an integer number (14745159).

Almost surely, 2^78611878 is an apocalyptic number.

78611878 is a deficient number, since it is larger than the sum of its proper divisors (39349394).

78611878 is a wasteful number, since it uses less digits than its factorization.

78611878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14486.

The product of its digits is 150528, while the sum is 46.

The square root of 78611878 is about 8866.3339661892. Note that the first 3 decimals coincide. The cubic root of 78611878 is about 428.3802012167.

The spelling of 78611878 in words is "seventy-eight million, six hundred eleven thousand, eight hundred seventy-eight".