722457649 has 4 divisors (see below), whose sum is σ = 729905764. Its totient is φ = 715009536.

The previous prime is 722457629. The next prime is 722457677. The reversal of 722457649 is 946754227.

It is a happy number.

722457649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 598536225 + 123921424 = 24465^2 + 11132^2 .

It is a cyclic number.

It is not a de Polignac number, because 722457649 - 2⁷ = 722457521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 722457599 and 722457608.

It is not an unprimeable number, because it can be changed into a prime (722457629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3723912 + ... + 3724105.

It is an arithmetic number, because the mean of its divisors is an integer number (182476441).

Almost surely, 2^722457649 is an apocalyptic number.

It is an amenable number.

722457649 is a deficient number, since it is larger than the sum of its proper divisors (7448115).

722457649 is an equidigital number, since it uses as much as digits as its factorization.

722457649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7448114.

The product of its digits is 846720, while the sum is 46.

The square root of 722457649 is about 26878.5723021146. The cubic root of 722457649 is about 897.2995800696.

The spelling of 722457649 in words is "seven hundred twenty-two million, four hundred fifty-seven thousand, six hundred forty-nine".