724890138 has 16 divisors (see below), whose sum is σ = 1656891840. Its totient is φ = 207111456.

The previous prime is 724890121. The next prime is 724890139. The reversal of 724890138 is 831098427.

724890138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 17259289 = 724890138 / (7 + 2 + 4 + 8 + 9 + 0 + 1 + 3 + 8).

It is a self number, because there is not a number n which added to its sum of digits gives 724890138.

It is not an unprimeable number, because it can be changed into a prime (724890139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8629603 + ... + 8629686.

It is an arithmetic number, because the mean of its divisors is an integer number (103555740).

Almost surely, 2^724890138 is an apocalyptic number.

724890138 is an abundant number, since it is smaller than the sum of its proper divisors (932001702).

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

724890138 is a wasteful number, since it uses less digits than its factorization.

724890138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17259301.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 724890138 is about 26923.7838722569. The cubic root of 724890138 is about 898.3055104400.

The spelling of 724890138 in words is "seven hundred twenty-four million, eight hundred ninety thousand, one hundred thirty-eight".