722816 has 16 divisors (see below), whose sum is σ = 1440240. Its totient is φ = 361344.

The previous prime is 722807. The next prime is 722819. The reversal of 722816 is 618227.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722819) by changing a digit.

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 as a sum of consecutive naturals, namely, 2696 + ... + 2951.

It is an arithmetic number, because the mean of its divisors is an integer number (90015).

2⁷²²⁸¹⁶ is an apocalyptic number.

It is an amenable number.

722816 is a deficient number, since it is larger than the sum of its proper divisors (717424).

722816 is an equidigital number, since it uses as much as digits as its factorization.

722816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5661 (or 5649 counting only the distinct ones).

The product of its digits is 1344, while the sum is 26.

The square root of 722816 is about 850.1858620325. The cubic root of 722816 is about 89.7447914048.

The spelling of 722816 in words is "seven hundred twenty-two thousand, eight hundred sixteen".