745138640 has 20 divisors (see below), whose sum is σ = 1732447524. Its totient is φ = 298055424.

The previous prime is 745138609. The next prime is 745138649. The reversal of 745138640 is 46831547.

745138640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 370793536 + 374345104 = 19256^2 + 19348^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 745138594 and 745138603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745138649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4657037 + ... + 4657196.

Almost surely, 2^745138640 is an apocalyptic number.

It is an amenable number.

745138640 is an abundant number, since it is smaller than the sum of its proper divisors (987308884).

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

745138640 is a wasteful number, since it uses less digits than its factorization.

745138640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9314246 (or 9314240 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 745138640 is about 27297.2276980649. The cubic root of 745138640 is about 906.5930003105.

The spelling of 745138640 in words is "seven hundred forty-five million, one hundred thirty-eight thousand, six hundred forty".