720556722 has 126 divisors (see below), whose sum is σ = 1757763693. Its totient is φ = 221394384.

The previous prime is 720556721. The next prime is 720556729. The reversal of 720556722 is 227655027.

720556722 is a `hidden beast` number, since 72 + 0 + 5 + 567 + 22 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 581340321 + 139216401 = 24111^2 + 11799^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=18981.

It is not an unprimeable number, because it can be changed into a prime (720556721) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 19474488 + ... + 19474524.

Almost surely, 2^720556722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 720556722

720556722 is an abundant number, since it is smaller than the sum of its proper divisors (1037206971).

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

720556722 is an equidigital number, since it uses as much as digits as its factorization.

720556722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 61 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 36.

The square root of 720556722 is about 26843.1876274037. The cubic root of 720556722 is about 896.5118987420.

The spelling of 720556722 in words is "seven hundred twenty million, five hundred fifty-six thousand, seven hundred twenty-two".