745645 has 8 divisors (see below), whose sum is σ = 900504. Its totient is φ = 592704.

The previous prime is 745631. The next prime is 745649. The reversal of 745645 is 546547.

It is a happy number.

745645 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 4 ways, for example, as 311364 + 434281 = 558^2 + 659^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 745645 - 2⁷ = 745517 is a prime.

It is a super-3 number, since 3×745645³ = 1243705585377633375, which contains 333 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745649) 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, 607 + ... + 1363.

It is an arithmetic number, because the mean of its divisors is an integer number (112563).

2⁷⁴⁵⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

745645 is a deficient number, since it is larger than the sum of its proper divisors (154859).

745645 is a wasteful number, since it uses less digits than its factorization.

745645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959.

The product of its digits is 16800, while the sum is 31.

The square root of 745645 is about 863.5073827131. The cubic root of 745645 is about 90.6798312656.

The spelling of 745645 in words is "seven hundred forty-five thousand, six hundred forty-five".