77860885622520 has 512 divisors, whose sum is σ = 316396935751680. Its totient is φ = 14802190663680.

The previous prime is 77860885622459. The next prime is 77860885622537. The reversal of 77860885622520 is 2522658806877.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 10705452 + ... + 16441668.

It is an arithmetic number, because the mean of its divisors is an integer number (617962765140).

Almost surely, 2^{77860885622520} is an apocalyptic number.

77860885622520 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77860885622520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158198467875840).

77860885622520 is an abundant number, since it is smaller than the sum of its proper divisors (238536050129160).

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

77860885622520 is a wasteful number, since it uses less digits than its factorization.

77860885622520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5736375 (or 5736371 counting only the distinct ones).

The product of its (nonzero) digits is 180633600, while the sum is 66.

The spelling of 77860885622520 in words is "seventy-seven trillion, eight hundred sixty billion, eight hundred eighty-five million, six hundred twenty-two thousand, five hundred twenty".