722636644 has 24 divisors (see below), whose sum is σ = 1298304000. Its totient is φ = 351731520.

The previous prime is 722636639. The next prime is 722636653. The reversal of 722636644 is 446636227.

It is a junction number, because it is equal to n+sod(n) for n = 722636597 and 722636606.

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, 73957 + ... + 83155.

It is an arithmetic number, because the mean of its divisors is an integer number (54096000).

Almost surely, 2^722636644 is an apocalyptic number.

It is an amenable number.

722636644 is a deficient number, since it is larger than the sum of its proper divisors (575667356).

722636644 is a wasteful number, since it uses less digits than its factorization.

722636644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9723 (or 9721 counting only the distinct ones).

The product of its digits is 290304, while the sum is 40.

The square root of 722636644 is about 26881.9017928420. The cubic root of 722636644 is about 897.3736784734.

The spelling of 722636644 in words is "seven hundred twenty-two million, six hundred thirty-six thousand, six hundred forty-four".