744640538 has 8 divisors (see below), whose sum is σ = 1121307732. Its totient is φ = 370871296.

The previous prime is 744640531. The next prime is 744640573. The reversal of 744640538 is 835046447.

It can be written as a sum of positive squares in 2 ways, for example, as 734572609 + 10067929 = 27103^2 + 3173^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 744640495 and 744640504.

It is not an unprimeable number, because it can be changed into a prime (744640531) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 723845 + ... + 724872.

Almost surely, 2^744640538 is an apocalyptic number.

744640538 is a deficient number, since it is larger than the sum of its proper divisors (376667194).

744640538 is a wasteful number, since it uses less digits than its factorization.

744640538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1448976.

The product of its (nonzero) digits is 322560, while the sum is 41.

The square root of 744640538 is about 27288.1024990746. The cubic root of 744640538 is about 906.3909455423.

The spelling of 744640538 in words is "seven hundred forty-four million, six hundred forty thousand, five hundred thirty-eight".