721020352 has 56 divisors (see below), whose sum is σ = 1544712176. Its totient is φ = 331941888.

The previous prime is 721020317. The next prime is 721020367. The reversal of 721020352 is 253020127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 434308 + ... + 435964.

It is an arithmetic number, because the mean of its divisors is an integer number (27584146).

Almost surely, 2^721020352 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 721020352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (772356088).

721020352 is an abundant number, since it is smaller than the sum of its proper divisors (823691824).

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

721020352 is a wasteful number, since it uses less digits than its factorization.

721020352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2205 (or 2195 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 721020352 is about 26851.8221355647. The cubic root of 721020352 is about 896.7041393079.

Adding to 721020352 its reverse (253020127), we get a palindrome (974040479).

The spelling of 721020352 in words is "seven hundred twenty-one million, twenty thousand, three hundred fifty-two".