722636649 has 24 divisors (see below), whose sum is σ = 1194253632. Its totient is φ = 412475040.

The previous prime is 722636639. The next prime is 722636653. The reversal of 722636649 is 946636227.

722636649 is a `hidden beast` number, since 7 + 2 + 2 + 636 + 6 + 4 + 9 = 666.

722636649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 722636649 - 2⁸ = 722636393 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (722636639) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55267 + ... + 67079.

It is an arithmetic number, because the mean of its divisors is an integer number (49760568).

Almost surely, 2^722636649 is an apocalyptic number.

It is an amenable number.

722636649 is a deficient number, since it is larger than the sum of its proper divisors (471616983).

722636649 is a wasteful number, since it uses less digits than its factorization.

722636649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12797 (or 12794 counting only the distinct ones).

The product of its digits is 653184, while the sum is 45.

The square root of 722636649 is about 26881.9018858413. The cubic root of 722636649 is about 897.3736805431.

The spelling of 722636649 in words is "seven hundred twenty-two million, six hundred thirty-six thousand, six hundred forty-nine".