77089717908 has 72 divisors (see below), whose sum is σ = 227442039552. Its totient is φ = 21556999872.

The previous prime is 77089717853. The next prime is 77089717997. The reversal of 77089717908 is 80971798077.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3242535 + ... + 3266222.

It is an arithmetic number, because the mean of its divisors is an integer number (3158917216).

Almost surely, 2^77089717908 is an apocalyptic number.

It is an amenable number.

77089717908 is an abundant number, since it is smaller than the sum of its proper divisors (150352321644).

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

77089717908 is a wasteful number, since it uses less digits than its factorization.

77089717908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6508821 (or 6508816 counting only the distinct ones).

The product of its (nonzero) digits is 12446784, while the sum is 63.

The spelling of 77089717908 in words is "seventy-seven billion, eighty-nine million, seven hundred seventeen thousand, nine hundred eight".