722446820 has 24 divisors (see below), whose sum is σ = 1534188600. Its totient is φ = 285731072.

The previous prime is 722446819. The next prime is 722446853. The reversal of 722446820 is 28644227.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 186431716 + 536015104 = 13654^2 + 23152^2 .

It is a super-2 number, since 2×722446820² = 1043858815456224800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201155 + ... + 204714.

It is an arithmetic number, because the mean of its divisors is an integer number (63924525).

Almost surely, 2^722446820 is an apocalyptic number.

It is an amenable number.

722446820 is an abundant number, since it is smaller than the sum of its proper divisors (811741780).

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

722446820 is a wasteful number, since it uses less digits than its factorization.

722446820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405967 (or 405965 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 35.

The square root of 722446820 is about 26878.3708583686. The cubic root of 722446820 is about 897.2950968053.

The spelling of 722446820 in words is "seven hundred twenty-two million, four hundred forty-six thousand, eight hundred twenty".