772121722880 has 128 divisors (see below), whose sum is σ = 1875422959200. Its totient is φ = 305122246656.

The previous prime is 772121722877. The next prime is 772121722907. The reversal of 772121722880 is 88227121277.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13570331 + ... + 13627109.

Almost surely, 2^772121722880 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 772121722880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (937711479600).

772121722880 is an abundant number, since it is smaller than the sum of its proper divisors (1103301236320).

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

772121722880 is an frugal number, since it uses more digits than its factorization.

772121722880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56897 (or 56869 counting only the distinct ones).

The product of its (nonzero) digits is 351232, while the sum is 47.

The spelling of 772121722880 in words is "seven hundred seventy-two billion, one hundred twenty-one million, seven hundred twenty-two thousand, eight hundred eighty".