722538 has 24 divisors (see below), whose sum is σ = 1582308. Its totient is φ = 238272.

The previous prime is 722537. The next prime is 722539. The reversal of 722538 is 835227.

It is an interprime number because it is at equal distance from previous prime (722537) and next prime (722539).

It can be written as a sum of positive squares in 2 ways, for example, as 651249 + 71289 = 807^2 + 267^2 .

It is a super-2 number, since 2×722538² = 1044122322888, which contains 22 as substring.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 722538.

It is not an unprimeable number, because it can be changed into a prime (722537) 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, 2320 + ... + 2612.

2⁷²²⁵³⁸ is an apocalyptic number.

722538 is an abundant number, since it is smaller than the sum of its proper divisors (859770).

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

722538 is a wasteful number, since it uses less digits than its factorization.

722538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438 (or 435 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 722538 is about 850.0223526473. The cubic root of 722538 is about 89.7332844417.

The spelling of 722538 in words is "seven hundred twenty-two thousand, five hundred thirty-eight".