721470240 has 240 divisors, whose sum is σ = 2568646080. Its totient is φ = 190702080.

The previous prime is 721470209. The next prime is 721470247. The reversal of 721470240 is 42074127.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (240).

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

It is not an unprimeable number, because it can be changed into a prime (721470247) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2319685 + ... + 2319995.

It is an arithmetic number, because the mean of its divisors is an integer number (10702692).

Almost surely, 2^721470240 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 721470240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1284323040).

721470240 is an abundant number, since it is smaller than the sum of its proper divisors (1847175840).

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

721470240 is a wasteful number, since it uses less digits than its factorization.

721470240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517 (or 500 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 721470240 is about 26860.1980633055. The cubic root of 721470240 is about 896.8906030947.

The spelling of 721470240 in words is "seven hundred twenty-one million, four hundred seventy thousand, two hundred forty".