745643 has 8 divisors (see below), whose sum is σ = 783360. Its totient is φ = 708840.

The previous prime is 745631. The next prime is 745649. The reversal of 745643 is 346547.

745643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 745643 - 2¹² = 741547 is a prime.

It is a Duffinian 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, 1898 + ... + 2256.

It is an arithmetic number, because the mean of its divisors is an integer number (97920).

2⁷⁴⁵⁶⁴³ is an apocalyptic number.

745643 is a deficient number, since it is larger than the sum of its proper divisors (37717).

745643 is a wasteful number, since it uses less digits than its factorization.

745643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457.

The product of its digits is 10080, while the sum is 29.

The square root of 745643 is about 863.5062246446. The cubic root of 745643 is about 90.6797501904.

The spelling of 745643 in words is "seven hundred forty-five thousand, six hundred forty-three".