77770790844 has 24 divisors (see below), whose sum is σ = 181747413120. Its totient is φ = 25883277744.

The previous prime is 77770790809. The next prime is 77770790869. The reversal of 77770790844 is 44809707777.

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, 5031864 + ... + 5047295.

It is an arithmetic number, because the mean of its divisors is an integer number (7572808880).

Almost surely, 2^77770790844 is an apocalyptic number.

It is an amenable number.

77770790844 is an abundant number, since it is smaller than the sum of its proper divisors (103976622276).

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

77770790844 is a wasteful number, since it uses less digits than its factorization.

77770790844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10079809 (or 10079807 counting only the distinct ones).

The product of its (nonzero) digits is 19361664, while the sum is 60.

The spelling of 77770790844 in words is "seventy-seven billion, seven hundred seventy million, seven hundred ninety thousand, eight hundred forty-four".