724644426 has 64 divisors (see below), whose sum is σ = 1605795840. Its totient is φ = 216181440.

The previous prime is 724644421. The next prime is 724644433. The reversal of 724644426 is 624446427.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (724644421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1891831 + ... + 1892213.

It is an arithmetic number, because the mean of its divisors is an integer number (25090560).

Almost surely, 2^724644426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 724644426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (802897920).

724644426 is an abundant number, since it is smaller than the sum of its proper divisors (881151414).

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

724644426 is a wasteful number, since it uses less digits than its factorization.

724644426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771.

The product of its digits is 258048, while the sum is 39.

The square root of 724644426 is about 26919.2203824702. The cubic root of 724644426 is about 898.2040010866.

The spelling of 724644426 in words is "seven hundred twenty-four million, six hundred forty-four thousand, four hundred twenty-six".