645305927 has 4 divisors (see below), whose sum is σ = 737492496. Its totient is φ = 553119360.

The previous prime is 645305909. The next prime is 645305959. The reversal of 645305927 is 729503546.

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 645305927 - 2¹⁰ = 645304903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645305977) 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, 46093274 + ... + 46093287.

It is an arithmetic number, because the mean of its divisors is an integer number (184373124).

Almost surely, 2^645305927 is an apocalyptic number.

645305927 is a deficient number, since it is larger than the sum of its proper divisors (92186569).

645305927 is an equidigital number, since it uses as much as digits as its factorization.

645305927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92186568.

The product of its (nonzero) digits is 226800, while the sum is 41.

The square root of 645305927 is about 25402.8724163233. The cubic root of 645305927 is about 864.1488400809.

The spelling of 645305927 in words is "six hundred forty-five million, three hundred five thousand, nine hundred twenty-seven".