722637 has 12 divisors (see below), whose sum is σ = 1089504. Its totient is φ = 460680.

The previous prime is 722633. The next prime is 722639. The reversal of 722637 is 736227.

722637 is a `hidden beast` number, since 7 + 22 + 637 = 666.

722637 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 722637 - 2² = 722633 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 722637.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 722637.

It is not an unprimeable number, because it can be changed into a prime (722633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1539 + ... + 1952.

It is an arithmetic number, because the mean of its divisors is an integer number (90792).

2⁷²²⁶³⁷ is an apocalyptic number.

It is an amenable number.

722637 is a deficient number, since it is larger than the sum of its proper divisors (366867).

722637 is a wasteful number, since it uses less digits than its factorization.

722637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3520 (or 3517 counting only the distinct ones).

The product of its digits is 3528, while the sum is 27.

The square root of 722637 is about 850.0805844154. The cubic root of 722637 is about 89.7373825834.

The spelling of 722637 in words is "seven hundred twenty-two thousand, six hundred thirty-seven".