77666056 has 32 divisors (see below), whose sum is σ = 157190040. Its totient is φ = 35762688.

The previous prime is 77666033. The next prime is 77666063. The reversal of 77666056 is 65066677.

It can be written as a sum of positive squares in 4 ways, for example, as 32103556 + 45562500 = 5666^2 + 6750^2 .

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, 82420 + ... + 83356.

Almost surely, 2^77666056 is an apocalyptic number.

It is an amenable number.

77666056 is an abundant number, since it is smaller than the sum of its proper divisors (79523984).

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

77666056 is a wasteful number, since it uses less digits than its factorization.

77666056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1753 (or 1749 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 43.

The square root of 77666056 is about 8812.8347312315. The cubic root of 77666056 is about 426.6552400369.

The spelling of 77666056 in words is "seventy-seven million, six hundred sixty-six thousand, fifty-six".