773720728722 has 30 divisors (see below), whose sum is σ = 1733732645733. Its totient is φ = 257903177688.

The previous prime is 773720728721. The next prime is 773720728747. The reversal of 773720728722 is 227827027377.

It can be written as a sum of positive squares in 2 ways, for example, as 767938495041 + 5782233681 = 876321^2 + 76041^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=621981.

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

It is not an unprimeable number, because it can be changed into a prime (773720728721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 11161104 + ... + 11230212.

Almost surely, 2^773720728722 is an apocalyptic number.

773720728722 is an abundant number, since it is smaller than the sum of its proper divisors (960011917011).

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

773720728722 is an frugal number, since it uses more digits than its factorization.

773720728722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138232 (or 69114 counting only the distinct ones).

The product of its (nonzero) digits is 6453888, while the sum is 54.

The spelling of 773720728722 in words is "seven hundred seventy-three billion, seven hundred twenty million, seven hundred twenty-eight thousand, seven hundred twenty-two".