722645 has 16 divisors (see below), whose sum is σ = 1081728. Its totient is φ = 450240.

The previous prime is 722639. The next prime is 722663. The reversal of 722645 is 546227.

722645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 722645 - 2⁶ = 722581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 554 + ... + 1323.

It is an arithmetic number, because the mean of its divisors is an integer number (67608).

2⁷²²⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

722645 is a deficient number, since it is larger than the sum of its proper divisors (359083).

722645 is a wasteful number, since it uses less digits than its factorization.

722645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1900.

The product of its digits is 3360, while the sum is 26.

The square root of 722645 is about 850.0852898386. The cubic root of 722645 is about 89.7377137300.

The spelling of 722645 in words is "seven hundred twenty-two thousand, six hundred forty-five".