77394765078 has 48 divisors (see below), whose sum is σ = 176945614560. Its totient is φ = 24399315072.

The previous prime is 77394765043. The next prime is 77394765079. The reversal of 77394765078 is 87056749377.

It is a super-2 number, since 2×77394765078² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77394765079) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1013401 + ... + 1087092.

It is an arithmetic number, because the mean of its divisors is an integer number (3686366970).

Almost surely, 2^77394765078 is an apocalyptic number.

77394765078 is an abundant number, since it is smaller than the sum of its proper divisors (99550849482).

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

77394765078 is a wasteful number, since it uses less digits than its factorization.

77394765078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100613 (or 2100610 counting only the distinct ones).

The product of its (nonzero) digits is 62233920, while the sum is 63.

The spelling of 77394765078 in words is "seventy-seven billion, three hundred ninety-four million, seven hundred sixty-five thousand, seventy-eight".