77878656 has 96 divisors (see below), whose sum is σ = 227674200. Its totient is φ = 25546752.

The previous prime is 77878627. The next prime is 77878679. The reversal of 77878656 is 65687877.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76680 + ... + 77688.

Almost surely, 2^77878656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77878656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113837100).

77878656 is an abundant number, since it is smaller than the sum of its proper divisors (149795544).

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

77878656 is a wasteful number, since it uses less digits than its factorization.

77878656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096 (or 1081 counting only the distinct ones).

The product of its digits is 3951360, while the sum is 54.

The square root of 77878656 is about 8824.8884412212. Note that the first 3 decimals coincide. The cubic root of 77878656 is about 427.0441884334.

The spelling of 77878656 in words is "seventy-seven million, eight hundred seventy-eight thousand, six hundred fifty-six".