77931496380 has 96 divisors (see below), whose sum is σ = 223871558400. Its totient is φ = 20248603648.

The previous prime is 77931496361. The next prime is 77931496381. The reversal of 77931496380 is 8369413977.

It is a self number, because there is not a number n which added to its sum of digits gives 77931496380.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77931496381) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 302611 + ... + 497429.

It is an arithmetic number, because the mean of its divisors is an integer number (2331995400).

Almost surely, 2^77931496380 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77931496380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111935779200).

77931496380 is an abundant number, since it is smaller than the sum of its proper divisors (145940062020).

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

77931496380 is a wasteful number, since it uses less digits than its factorization.

77931496380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195003 (or 195001 counting only the distinct ones).

The product of its (nonzero) digits is 6858432, while the sum is 57.

The spelling of 77931496380 in words is "seventy-seven billion, nine hundred thirty-one million, four hundred ninety-six thousand, three hundred eighty".