77790904262520 has 256 divisors, whose sum is σ = 252341984793600. Its totient is φ = 19117717770240.

The previous prime is 77790904262507. The next prime is 77790904262527. The reversal of 77790904262520 is 2526240909777.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77790904262527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 466174300 + ... + 466341140.

It is an arithmetic number, because the mean of its divisors is an integer number (985710878100).

Almost surely, 2^{77790904262520} 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 77790904262520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126170992396800).

77790904262520 is an abundant number, since it is smaller than the sum of its proper divisors (174551080531080).

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

77790904262520 is a wasteful number, since it uses less digits than its factorization.

77790904262520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172438 (or 172434 counting only the distinct ones).

The product of its (nonzero) digits is 26671680, while the sum is 60.

The spelling of 77790904262520 in words is "seventy-seven trillion, seven hundred ninety billion, nine hundred four million, two hundred sixty-two thousand, five hundred twenty".