744640537 has 4 divisors (see below), whose sum is σ = 748800720. Its totient is φ = 740480356.

The previous prime is 744640531. The next prime is 744640573. The reversal of 744640537 is 735046447.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-744640537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 744640537.

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, 2079823 + ... + 2080180.

It is an arithmetic number, because the mean of its divisors is an integer number (187200180).

Almost surely, 2^744640537 is an apocalyptic number.

It is an amenable number.

744640537 is a deficient number, since it is larger than the sum of its proper divisors (4160183).

744640537 is a wasteful number, since it uses less digits than its factorization.

744640537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4160182.

The product of its (nonzero) digits is 282240, while the sum is 40.

The square root of 744640537 is about 27288.1024807516. The cubic root of 744640537 is about 906.3909451365.

The spelling of 744640537 in words is "seven hundred forty-four million, six hundred forty thousand, five hundred thirty-seven".