744640 has 56 divisors (see below), whose sum is σ = 1920240. Its totient is φ = 273408.

The previous prime is 744637. The next prime is 744641. The reversal of 744640 is 46447.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (744641) 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, 4071 + ... + 4249.

It is an arithmetic number, because the mean of its divisors is an integer number (34290).

2⁷⁴⁴⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 744640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (960120).

744640 is an abundant number, since it is smaller than the sum of its proper divisors (1175600).

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

744640 is a wasteful number, since it uses less digits than its factorization.

744640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 744640 is about 862.9252574818. The cubic root of 744640 is about 90.6390727254.

The spelling of 744640 in words is "seven hundred forty-four thousand, six hundred forty".