645286723 has 2 divisors, whose sum is σ = 645286724. Its totient is φ = 645286722.

The previous prime is 645286693. The next prime is 645286727. The reversal of 645286723 is 327682546.

645286723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645286723 - 2⁹ = 645286211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645286723.

It is not a weakly prime, because it can be changed into another prime (645286727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322643361 + 322643362.

It is an arithmetic number, because the mean of its divisors is an integer number (322643362).

Almost surely, 2^645286723 is an apocalyptic number.

645286723 is a deficient number, since it is larger than the sum of its proper divisors (1).

645286723 is an equidigital number, since it uses as much as digits as its factorization.

645286723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 43.

The square root of 645286723 is about 25402.4944247607. The cubic root of 645286723 is about 864.1402677753.

The spelling of 645286723 in words is "six hundred forty-five million, two hundred eighty-six thousand, seven hundred twenty-three".