722428 has 12 divisors (see below), whose sum is σ = 1444912. Its totient is φ = 309600.

The previous prime is 722417. The next prime is 722431. The reversal of 722428 is 824227.

722428 is an admirable number.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12873 + ... + 12928.

2⁷²²⁴²⁸ is an apocalyptic number.

It is an amenable number.

722428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

722428 is a wasteful number, since it uses less digits than its factorization.

722428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25812 (or 25810 counting only the distinct ones).

The product of its digits is 1792, while the sum is 25.

The square root of 722428 is about 849.9576460036. The cubic root of 722428 is about 89.7287305117.

It can be divided in two parts, 72 and 2428, that added together give a square (2500 = 50²).

The spelling of 722428 in words is "seven hundred twenty-two thousand, four hundred twenty-eight".