645753 has 8 divisors (see below), whose sum is σ = 906400. Its totient is φ = 407808.

The previous prime is 645751. The next prime is 645763. The reversal of 645753 is 357546.

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

It is not a de Polignac number, because 645753 - 2¹ = 645751 is a prime.

It is a Duffinian number.

645753 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 645753.

It is not an unprimeable number, because it can be changed into a prime (645751) 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, 5608 + ... + 5721.

It is an arithmetic number, because the mean of its divisors is an integer number (113300).

2⁶⁴⁵⁷⁵³ is an apocalyptic number.

It is an amenable number.

645753 is a deficient number, since it is larger than the sum of its proper divisors (260647).

645753 is a wasteful number, since it uses less digits than its factorization.

645753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11351.

The product of its digits is 12600, while the sum is 30.

The square root of 645753 is about 803.5875807900. The cubic root of 645753 is about 86.4348357040.

The spelling of 645753 in words is "six hundred forty-five thousand, seven hundred fifty-three".