645302923 has 4 divisors (see below), whose sum is σ = 645943480. Its totient is φ = 644662368.

The previous prime is 645302921. The next prime is 645302941. The reversal of 645302923 is 329203546.

645302923 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.

It is a cyclic number.

It is not a de Polignac number, because 645302923 - 2¹ = 645302921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645302921) 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, 318765 + ... + 320782.

It is an arithmetic number, because the mean of its divisors is an integer number (161485870).

Almost surely, 2^645302923 is an apocalyptic number.

645302923 is a deficient number, since it is larger than the sum of its proper divisors (640557).

645302923 is a wasteful number, since it uses less digits than its factorization.

645302923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640556.

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 645302923 is about 25402.8132890828. The cubic root of 645302923 is about 864.1474991629.

The spelling of 645302923 in words is "six hundred forty-five million, three hundred two thousand, nine hundred twenty-three".