77907768 has 16 divisors (see below), whose sum is σ = 194769480. Its totient is φ = 25969248.

The previous prime is 77907763. The next prime is 77907773. The reversal of 77907768 is 86770977.

It is an interprime number because it is at equal distance from previous prime (77907763) and next prime (77907773).

It is a self number, because there is not a number n which added to its sum of digits gives 77907768.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77907763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1623055 + ... + 1623102.

Almost surely, 2^77907768 is an apocalyptic number.

It is an amenable number.

77907768 is an abundant number, since it is smaller than the sum of its proper divisors (116861712).

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

77907768 is a wasteful number, since it uses less digits than its factorization.

77907768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3246166 (or 3246162 counting only the distinct ones).

The product of its (nonzero) digits is 1037232, while the sum is 51.

The square root of 77907768 is about 8826.5377130560. The cubic root of 77907768 is about 427.0973932620.

The spelling of 77907768 in words is "seventy-seven million, nine hundred seven thousand, seven hundred sixty-eight".