722447640 has 384 divisors, whose sum is σ = 2715768000. Its totient is φ = 170201088.

The previous prime is 722447633. The next prime is 722447701. The reversal of 722447640 is 46744227.

It is a happy number.

722447640 is a `hidden beast` number, since 7 + 2 + 2 + 4 + 4 + 7 + 640 = 666.

722447640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 722447595 and 722447604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6627906 + ... + 6628014.

Almost surely, 2^722447640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 722447640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1357884000).

722447640 is an abundant number, since it is smaller than the sum of its proper divisors (1993320360).

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

722447640 is a wasteful number, since it uses less digits than its factorization.

722447640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 36.

The square root of 722447640 is about 26878.3861122650. The cubic root of 722447640 is about 897.2954362913.

The spelling of 722447640 in words is "seven hundred twenty-two million, four hundred forty-seven thousand, six hundred forty".