721311234 has 64 divisors (see below), whose sum is σ = 1724405760. Its totient is φ = 196669440.

The previous prime is 721311233. The next prime is 721311247. The reversal of 721311234 is 432113127.

It is a happy number.

721311234 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (721311233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 742369 + ... + 743339.

It is an arithmetic number, because the mean of its divisors is an integer number (26943840).

Almost surely, 2^721311234 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721311234, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (862202880).

721311234 is an abundant number, since it is smaller than the sum of its proper divisors (1003094526).

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

721311234 is a wasteful number, since it uses less digits than its factorization.

721311234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775.

The product of its digits is 1008, while the sum is 24.

The square root of 721311234 is about 26857.2380188284. The cubic root of 721311234 is about 896.8247091939.

The spelling of 721311234 in words is "seven hundred twenty-one million, three hundred eleven thousand, two hundred thirty-four".