724722240 has 336 divisors, whose sum is σ = 2685263616. Its totient is φ = 164904960.

The previous prime is 724722239. The next prime is 724722253. The reversal of 724722240 is 42227427.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 724722198 and 724722207.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1974537 + ... + 1974903.

It is an arithmetic number, because the mean of its divisors is an integer number (7991856).

Almost surely, 2^724722240 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 724722240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1342631808).

724722240 is an abundant number, since it is smaller than the sum of its proper divisors (1960541376).

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

724722240 is a wasteful number, since it uses less digits than its factorization.

724722240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 30.

The square root of 724722240 is about 26920.6656678471. The cubic root of 724722240 is about 898.2361503459.

Adding to 724722240 its reverse (42227427), we get a palindrome (766949667).

The spelling of 724722240 in words is "seven hundred twenty-four million, seven hundred twenty-two thousand, two hundred forty".