722216640 has 224 divisors, whose sum is σ = 2396459520. Its totient is φ = 184115200.

The previous prime is 722216633. The next prime is 722216683. The reversal of 722216640 is 46612227.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 722216598 and 722216607.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2322085 + ... + 2322395.

It is an arithmetic number, because the mean of its divisors is an integer number (10698480).

Almost surely, 2^722216640 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 722216640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1198229760).

722216640 is an abundant number, since it is smaller than the sum of its proper divisors (1674242880).

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

722216640 is a wasteful number, since it uses less digits than its factorization.

722216640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 722216640 is about 26874.0886357100. The cubic root of 722216640 is about 897.1997904479.

Adding to 722216640 its reverse (46612227), we get a palindrome (768828867).

The spelling of 722216640 in words is "seven hundred twenty-two million, two hundred sixteen thousand, six hundred forty".