77680878 has 16 divisors (see below), whose sum is σ = 169485696. Its totient is φ = 23539640.

The previous prime is 77680861. The next prime is 77680901. The reversal of 77680878 is 87808677.

It is a self number, because there is not a number n which added to its sum of digits gives 77680878.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 588426 + ... + 588557.

It is an arithmetic number, because the mean of its divisors is an integer number (10592856).

Almost surely, 2^77680878 is an apocalyptic number.

77680878 is an abundant number, since it is smaller than the sum of its proper divisors (91804818).

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

77680878 is a wasteful number, since it uses less digits than its factorization.

77680878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176999.

The product of its (nonzero) digits is 1053696, while the sum is 51.

The square root of 77680878 is about 8813.6756237111. The cubic root of 77680878 is about 426.6823796568.

The spelling of 77680878 in words is "seventy-seven million, six hundred eighty thousand, eight hundred seventy-eight".