77976503280 has 480 divisors, whose sum is σ = 293911188480. Its totient is φ = 19099100160.

The previous prime is 77976503233. The next prime is 77976503317. The reversal of 77976503280 is 8230567977.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 60399435 + ... + 60400725.

It is an arithmetic number, because the mean of its divisors is an integer number (612314976).

Almost surely, 2^77976503280 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 77976503280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146955594240).

77976503280 is an abundant number, since it is smaller than the sum of its proper divisors (215934685200).

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

77976503280 is a wasteful number, since it uses less digits than its factorization.

77976503280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571 (or 1553 counting only the distinct ones).

The product of its (nonzero) digits is 4445280, while the sum is 54.

The spelling of 77976503280 in words is "seventy-seven billion, nine hundred seventy-six million, five hundred three thousand, two hundred eighty".