77768766 has 12 divisors (see below), whose sum is σ = 168499032. Its totient is φ = 25922916.

The previous prime is 77768741. The next prime is 77768809. The reversal of 77768766 is 66786777.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2160226 + ... + 2160261.

It is an arithmetic number, because the mean of its divisors is an integer number (14041586).

Almost surely, 2^77768766 is an apocalyptic number.

77768766 is an abundant number, since it is smaller than the sum of its proper divisors (90730266).

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

77768766 is a wasteful number, since it uses less digits than its factorization.

77768766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4320495 (or 4320492 counting only the distinct ones).

The product of its digits is 4148928, while the sum is 54.

The square root of 77768766 is about 8818.6601023058. The cubic root of 77768766 is about 426.8432348902.

The spelling of 77768766 in words is "seventy-seven million, seven hundred sixty-eight thousand, seven hundred sixty-six".