722738 has 16 divisors (see below), whose sum is σ = 1189080. Its totient is φ = 327936.

The previous prime is 722737. The next prime is 722749. The reversal of 722738 is 837227.

It can be written as a sum of positive squares in 4 ways, for example, as 717409 + 5329 = 847^2 + 73^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a self number, because there is not a number n which added to its sum of digits gives 722738.

It is not an unprimeable number, because it can be changed into a prime (722737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 620 + ... + 1352.

2⁷²²⁷³⁸ is an apocalyptic number.

722738 is a deficient number, since it is larger than the sum of its proper divisors (466342).

722738 is a wasteful number, since it uses less digits than its factorization.

722738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781.

The product of its digits is 4704, while the sum is 29.

The square root of 722738 is about 850.1399884725. The cubic root of 722738 is about 89.7415631302.

It can be divided in two parts, 72 and 2738, that multiplied together give a square (197136 = 444²).

The spelling of 722738 in words is "seven hundred twenty-two thousand, seven hundred thirty-eight".