721288260 has 576 divisors, whose sum is σ = 3003033600. Its totient is φ = 140279040.

The previous prime is 721288247. The next prime is 721288313. The reversal of 721288260 is 62882127.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 8690179 + ... + 8690261.

It is an arithmetic number, because the mean of its divisors is an integer number (5213600).

Almost surely, 2^721288260 is an apocalyptic number.

721288260 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721288260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1501516800).

721288260 is an abundant number, since it is smaller than the sum of its proper divisors (2281745340).

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

721288260 is a wasteful number, since it uses less digits than its factorization.

721288260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 721288260 is about 26856.8103094913. The cubic root of 721288260 is about 896.8151877055.

The spelling of 721288260 in words is "seven hundred twenty-one million, two hundred eighty-eight thousand, two hundred sixty".