721411620 has 96 divisors (see below), whose sum is σ = 2092366080. Its totient is φ = 185602560.

The previous prime is 721411597. The next prime is 721411651. The reversal of 721411620 is 26114127.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 192121 + ... + 195839.

It is an arithmetic number, because the mean of its divisors is an integer number (21795480).

Almost surely, 2^721411620 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 721411620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1046183040).

721411620 is an abundant number, since it is smaller than the sum of its proper divisors (1370954460).

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

721411620 is a wasteful number, since it uses less digits than its factorization.

721411620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3845 (or 3843 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 721411620 is about 26859.1068354851. The cubic root of 721411620 is about 896.8663114246.

Adding to 721411620 its reverse (26114127), we get a palindrome (747525747).

The spelling of 721411620 in words is "seven hundred twenty-one million, four hundred eleven thousand, six hundred twenty".