721712922 has 48 divisors (see below), whose sum is σ = 1704655296. Its totient is φ = 199540800.

The previous prime is 721712911. The next prime is 721712969. The reversal of 721712922 is 229217127.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31422 + ... + 49302.

It is an arithmetic number, because the mean of its divisors is an integer number (35513652).

Almost surely, 2^721712922 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721712922, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (852327648).

721712922 is an abundant number, since it is smaller than the sum of its proper divisors (982942374).

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

721712922 is a wasteful number, since it uses less digits than its factorization.

721712922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17955 (or 17924 counting only the distinct ones).

The product of its digits is 7056, while the sum is 33.

The square root of 721712922 is about 26864.7151855366. The cubic root of 721712922 is about 896.9911546227.

The spelling of 721712922 in words is "seven hundred twenty-one million, seven hundred twelve thousand, nine hundred twenty-two".