76687720816 has 80 divisors (see below), whose sum is σ = 172988213760. Its totient is φ = 32254421760.

The previous prime is 76687720757. The next prime is 76687720841. The reversal of 76687720816 is 61802778667.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1999581 + ... + 2037571.

It is an arithmetic number, because the mean of its divisors is an integer number (2162352672).

Almost surely, 2^76687720816 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 76687720816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86494106880).

76687720816 is an abundant number, since it is smaller than the sum of its proper divisors (96300492944).

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

76687720816 is a wasteful number, since it uses less digits than its factorization.

76687720816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38342 (or 38336 counting only the distinct ones).

The product of its (nonzero) digits is 9483264, while the sum is 58.

The spelling of 76687720816 in words is "seventy-six billion, six hundred eighty-seven million, seven hundred twenty thousand, eight hundred sixteen".