721410240 has 112 divisors (see below), whose sum is σ = 2411089920. Its totient is φ = 182246400.

The previous prime is 721410233. The next prime is 721410251. The reversal of 721410240 is 42014127.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1536 + ... + 38015.

Almost surely, 2^721410240 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 721410240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1205544960).

721410240 is an abundant number, since it is smaller than the sum of its proper divisors (1689679680).

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

721410240 is a wasteful number, since it uses less digits than its factorization.

721410240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39590 (or 39580 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 721410240 is about 26859.0811458620. The cubic root of 721410240 is about 896.8657395475.

Adding to 721410240 its reverse (42014127), we get a palindrome (763424367).

The spelling of 721410240 in words is "seven hundred twenty-one million, four hundred ten thousand, two hundred forty".