77656816 has 40 divisors (see below), whose sum is σ = 161534304. Its totient is φ = 36034560.

The previous prime is 77656807. The next prime is 77656847. The reversal of 77656816 is 61865677.

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, 17901 + ... + 21811.

Almost surely, 2^77656816 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 77656816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80767152).

77656816 is an abundant number, since it is smaller than the sum of its proper divisors (83877488).

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

77656816 is a wasteful number, since it uses less digits than its factorization.

77656816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4009 (or 4003 counting only the distinct ones).

The product of its digits is 423360, while the sum is 46.

The square root of 77656816 is about 8812.3104802316. The cubic root of 77656816 is about 426.6383195143.

The spelling of 77656816 in words is "seventy-seven million, six hundred fifty-six thousand, eight hundred sixteen".