722238640 has 160 divisors (see below), whose sum is σ = 1876308480. Its totient is φ = 257292288.

The previous prime is 722238599. The next prime is 722238661. The reversal of 722238640 is 46832227.

It is a junction number, because it is equal to n+sod(n) for n = 722238596 and 722238605.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2551939 + ... + 2552221.

It is an arithmetic number, because the mean of its divisors is an integer number (11726928).

Almost surely, 2^722238640 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 722238640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (938154240).

722238640 is an abundant number, since it is smaller than the sum of its proper divisors (1154069840).

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

722238640 is a wasteful number, since it uses less digits than its factorization.

722238640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 722238640 is about 26874.4979487990. The cubic root of 722238640 is about 897.2089004544.

The spelling of 722238640 in words is "seven hundred twenty-two million, two hundred thirty-eight thousand, six hundred forty".