721944839452320 has 288 divisors, whose sum is σ = 2829056573004480. Its totient is φ = 165805513297920.

The previous prime is 721944839452307. The next prime is 721944839452321. The reversal of 721944839452320 is 23254938449127.

It is a happy number.

721944839452320 is a `hidden beast` number, since 7 + 2 + 1 + 9 + 4 + 4 + 8 + 394 + 5 + 232 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a super-2 number, since 2×721944839452320² (a number of 31 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (721944839452321) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1199102349 + ... + 1199704268.

It is an arithmetic number, because the mean of its divisors is an integer number (9823113100710).

Almost surely, 2^{721944839452320} is an apocalyptic number.

It is an amenable number.

721944839452320 is an abundant number, since it is smaller than the sum of its proper divisors (2107111733552160).

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

721944839452320 is a wasteful number, since it uses less digits than its factorization.

721944839452320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2398806668 (or 2398806657 counting only the distinct ones).

The product of its (nonzero) digits is 104509440, while the sum is 63.

The spelling of 721944839452320 in words is "seven hundred twenty-one trillion, nine hundred forty-four billion, eight hundred thirty-nine million, four hundred fifty-two thousand, three hundred twenty".