724840638 has 8 divisors (see below), whose sum is σ = 1449681288. Its totient is φ = 241613544.

The previous prime is 724840603. The next prime is 724840651. The reversal of 724840638 is 836048427.

724840638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

724840638 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 724840638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60403381 + ... + 60403392.

It is an arithmetic number, because the mean of its divisors is an integer number (181210161).

Almost surely, 2^724840638 is an apocalyptic number.

724840638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

724840638 is a wasteful number, since it uses less digits than its factorization.

724840638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120806778.

The product of its (nonzero) digits is 258048, while the sum is 42.

The square root of 724840638 is about 26922.8645949869. The cubic root of 724840638 is about 898.2850626817.

The spelling of 724840638 in words is "seven hundred twenty-four million, eight hundred forty thousand, six hundred thirty-eight".