721260720 has 160 divisors (see below), whose sum is σ = 2496983040. Its totient is φ = 191358720.

The previous prime is 721260689. The next prime is 721260733. The reversal of 721260720 is 27062127.

721260720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 489585 + ... + 491055.

It is an arithmetic number, because the mean of its divisors is an integer number (15606144).

Almost surely, 2^721260720 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 721260720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1248491520).

721260720 is an abundant number, since it is smaller than the sum of its proper divisors (1775722320).

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

721260720 is a wasteful number, since it uses less digits than its factorization.

721260720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1720 (or 1708 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 721260720 is about 26856.2975854826. The cubic root of 721260720 is about 896.8037735890.

The spelling of 721260720 in words is "seven hundred twenty-one million, two hundred sixty thousand, seven hundred twenty".