722624 has 28 divisors (see below), whose sum is σ = 1639824. Its totient is φ = 309504.

The previous prime is 722611. The next prime is 722633. The reversal of 722624 is 426227.

It is a tau number, because it is divible by the number of its divisors (28).

It is a self number, because there is not a number n which added to its sum of digits gives 722624.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359 + ... + 1254.

2⁷²²⁶²⁴ is an apocalyptic number.

It is an amenable number.

722624 is an abundant number, since it is smaller than the sum of its proper divisors (917200).

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

722624 is a wasteful number, since it uses less digits than its factorization.

722624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632 (or 1622 counting only the distinct ones).

The product of its digits is 1344, while the sum is 23.

The square root of 722624 is about 850.0729380471. The cubic root of 722624 is about 89.7368444649.

The spelling of 722624 in words is "seven hundred twenty-two thousand, six hundred twenty-four".