77808255078 has 16 divisors (see below), whose sum is σ = 157070871360. Its totient is φ = 25693691496.

The previous prime is 77808255037. The next prime is 77808255089. The reversal of 77808255078 is 87055280877.

It is a super-2 number, since 2×77808255078² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60597688 + ... + 60598971.

It is an arithmetic number, because the mean of its divisors is an integer number (9816929460).

Almost surely, 2^77808255078 is an apocalyptic number.

77808255078 is an abundant number, since it is smaller than the sum of its proper divisors (79262616282).

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

77808255078 is a wasteful number, since it uses less digits than its factorization.

77808255078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121196771.

The product of its (nonzero) digits is 8780800, while the sum is 57.

The spelling of 77808255078 in words is "seventy-seven billion, eight hundred eight million, two hundred fifty-five thousand, seventy-eight".