645793 has 4 divisors (see below), whose sum is σ = 648448. Its totient is φ = 643140.

The previous prime is 645787. The next prime is 645803. The reversal of 645793 is 397546.

645793 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 645793 - 2¹³ = 637601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645703) 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, 921 + ... + 1462.

It is an arithmetic number, because the mean of its divisors is an integer number (162112).

2⁶⁴⁵⁷⁹³ is an apocalyptic number.

It is an amenable number.

645793 is a deficient number, since it is larger than the sum of its proper divisors (2655).

645793 is a wasteful number, since it uses less digits than its factorization.

645793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2654.

The product of its digits is 22680, while the sum is 34.

The square root of 645793 is about 803.6124687933. The cubic root of 645793 is about 86.4366203503.

The spelling of 645793 in words is "six hundred forty-five thousand, seven hundred ninety-three".