77702317940 has 24 divisors (see below), whose sum is σ = 175726781160. Its totient is φ = 28690086528.

The previous prime is 77702317769. The next prime is 77702317949. The reversal of 77702317940 is 4971320777.

It can be written as a sum of positive squares in 4 ways, for example, as 4251561616 + 73450756324 = 65204^2 + 271018^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77702317949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149427275 + ... + 149427794.

It is an arithmetic number, because the mean of its divisors is an integer number (7321949215).

Almost surely, 2^77702317940 is an apocalyptic number.

It is an amenable number.

77702317940 is an abundant number, since it is smaller than the sum of its proper divisors (98024463220).

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

77702317940 is a wasteful number, since it uses less digits than its factorization.

77702317940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298855091 (or 298855089 counting only the distinct ones).

The product of its (nonzero) digits is 518616, while the sum is 47.

The spelling of 77702317940 in words is "seventy-seven billion, seven hundred two million, three hundred seventeen thousand, nine hundred forty".