645763 has 2 divisors, whose sum is σ = 645764. Its totient is φ = 645762.

The previous prime is 645751. The next prime is 645787. The reversal of 645763 is 367546.

645763 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645763 is a prime.

It is not a weakly prime, because it can be changed into another prime (645703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322881 + 322882.

It is an arithmetic number, because the mean of its divisors is an integer number (322882).

2⁶⁴⁵⁷⁶³ is an apocalyptic number.

645763 is a deficient number, since it is larger than the sum of its proper divisors (1).

645763 is an equidigital number, since it uses as much as digits as its factorization.

645763 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 31.

The square root of 645763 is about 803.5938028631. The cubic root of 645763 is about 86.4352818725.

The spelling of 645763 in words is "six hundred forty-five thousand, seven hundred sixty-three".