77666776 has 16 divisors (see below), whose sum is σ = 158864040. Its totient is φ = 35303040.

The previous prime is 77666773. The next prime is 77666789. The reversal of 77666776 is 67766677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77666773) 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 3 ways as a sum of consecutive naturals, for example, 441201 + ... + 441376.

Almost surely, 2^77666776 is an apocalyptic number.

It is an amenable number.

77666776 is an abundant number, since it is smaller than the sum of its proper divisors (81197264).

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

77666776 is a wasteful number, since it uses less digits than its factorization.

77666776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882594 (or 882590 counting only the distinct ones).

The product of its digits is 3111696, while the sum is 52.

The square root of 77666776 is about 8812.8755806490. The cubic root of 77666776 is about 426.6565584628.

Subtracting from 77666776 its reverse (67766677), we obtain a palindrome (9900099).

The spelling of 77666776 in words is "seventy-seven million, six hundred sixty-six thousand, seven hundred seventy-six".