721608822 has 96 divisors (see below), whose sum is σ = 1748597760. Its totient is φ = 213226560.

The previous prime is 721608821. The next prime is 721608829. The reversal of 721608822 is 228806127.

It is a happy number.

721608822 is a `hidden beast` number, since 7 + 21 + 608 + 8 + 22 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721608821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2604948 + ... + 2605224.

It is an arithmetic number, because the mean of its divisors is an integer number (18214560).

Almost surely, 2^721608822 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721608822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (874298880).

721608822 is an abundant number, since it is smaller than the sum of its proper divisors (1026988938).

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

721608822 is a wasteful number, since it uses less digits than its factorization.

721608822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578 (or 575 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 721608822 is about 26862.7776300218. Note that the first 3 decimals coincide. The cubic root of 721608822 is about 896.9480251612.

The spelling of 721608822 in words is "seven hundred twenty-one million, six hundred eight thousand, eight hundred twenty-two".