77931877340 has 96 divisors (see below), whose sum is σ = 170113063680. Its totient is φ = 29972606976.

The previous prime is 77931877333. The next prime is 77931877357. The reversal of 77931877340 is 4377813977.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11468984 + ... + 11475776.

It is an arithmetic number, because the mean of its divisors is an integer number (1772011080).

Almost surely, 2^77931877340 is an apocalyptic number.

It is an amenable number.

77931877340 is an abundant number, since it is smaller than the sum of its proper divisors (92181186340).

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

77931877340 is a wasteful number, since it uses less digits than its factorization.

77931877340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7071 (or 7069 counting only the distinct ones).

The product of its (nonzero) digits is 6223392, while the sum is 56.

It can be divided in two parts, 779318 and 77340, that added together give a palindrome (856658).

The spelling of 77931877340 in words is "seventy-seven billion, nine hundred thirty-one million, eight hundred seventy-seven thousand, three hundred forty".