77851656 has 48 divisors (see below), whose sum is σ = 213532800. Its totient is φ = 25620192.

The previous prime is 77851651. The next prime is 77851667. The reversal of 77851656 is 65615877.

It is not an unprimeable number, because it can be changed into a prime (77851651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1156 + ... + 12531.

It is an arithmetic number, because the mean of its divisors is an integer number (4448600).

Almost surely, 2^77851656 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 77851656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106766400).

77851656 is an abundant number, since it is smaller than the sum of its proper divisors (135681144).

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

77851656 is a wasteful number, since it uses less digits than its factorization.

77851656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13778 (or 13771 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 77851656 is about 8823.3585442279. The cubic root of 77851656 is about 426.9948316245.

The spelling of 77851656 in words is "seventy-seven million, eight hundred fifty-one thousand, six hundred fifty-six".