77988788 has 12 divisors (see below), whose sum is σ = 136544100. Its totient is φ = 38976192.

The previous prime is 77988761. The next prime is 77988793. The reversal of 77988788 is 88788977.

It can be written as a sum of positive squares in 2 ways, for example, as 23406244 + 54582544 = 4838^2 + 7388^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 77988788.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 10970 + ... + 16622.

It is an arithmetic number, because the mean of its divisors is an integer number (11378675).

Almost surely, 2^77988788 is an apocalyptic number.

It is an amenable number.

77988788 is a deficient number, since it is larger than the sum of its proper divisors (58555312).

77988788 is a wasteful number, since it uses less digits than its factorization.

77988788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9106 (or 9104 counting only the distinct ones).

The product of its digits is 12644352, while the sum is 62.

The square root of 77988788 is about 8831.1260890104. The cubic root of 77988788 is about 427.2453949456.

The spelling of 77988788 in words is "seventy-seven million, nine hundred eighty-eight thousand, seven hundred eighty-eight".