721822992 has 320 divisors, whose sum is σ = 2314137600. Its totient is φ = 191242240.

The previous prime is 721822987. The next prime is 721822993. The reversal of 721822992 is 299228127.

Its product of digits (72576) is a multiple of the sum of its prime divisors (168).

It is not an unprimeable number, because it can be changed into a prime (721822993) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12234259 + ... + 12234317.

It is an arithmetic number, because the mean of its divisors is an integer number (7231680).

Almost surely, 2^721822992 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 721822992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1157068800).

721822992 is an abundant number, since it is smaller than the sum of its proper divisors (1592314608).

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

721822992 is a wasteful number, since it uses less digits than its factorization.

721822992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 168 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 721822992 is about 26866.7637053665. The cubic root of 721822992 is about 897.0367529922.

The spelling of 721822992 in words is "seven hundred twenty-one million, eight hundred twenty-two thousand, nine hundred ninety-two".