77788866 has 8 divisors (see below), whose sum is σ = 155577744. Its totient is φ = 25929620.

The previous prime is 77788819. The next prime is 77788939. The reversal of 77788866 is 66888777.

It is a sphenic number, since it is the product of 3 distinct primes.

77788866 is an admirable number.

It is a super-2 number, since 2×77788866² = 12102215347131912, which contains 22 as substring.

It is a Curzon number.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6482400 + ... + 6482411.

It is an arithmetic number, because the mean of its divisors is an integer number (19447218).

Almost surely, 2^77788866 is an apocalyptic number.

77788866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

77788866 is a wasteful number, since it uses less digits than its factorization.

77788866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12964816.

The product of its digits is 6322176, while the sum is 57.

The square root of 77788866 is about 8819.7996575886. The cubic root of 77788866 is about 426.8800054791.

The spelling of 77788866 in words is "seventy-seven million, seven hundred eighty-eight thousand, eight hundred sixty-six".