77766156 has 120 divisors (see below), whose sum is σ = 225302000. Its totient is φ = 23234688.

The previous prime is 77766137. The next prime is 77766167. The reversal of 77766156 is 65166777.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 155595 + ... + 156093.

Almost surely, 2^77766156 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 77766156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112651000).

77766156 is an abundant number, since it is smaller than the sum of its proper divisors (147535844).

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

77766156 is a wasteful number, since it uses less digits than its factorization.

77766156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565 (or 554 counting only the distinct ones).

The product of its digits is 370440, while the sum is 45.

The square root of 77766156 is about 8818.5121193997. The cubic root of 77766156 is about 426.8384597371.

The spelling of 77766156 in words is "seventy-seven million, seven hundred sixty-six thousand, one hundred fifty-six".