645795 has 24 divisors (see below), whose sum is σ = 1138176. Its totient is φ = 338688.

The previous prime is 645787. The next prime is 645803. The reversal of 645795 is 597546.

645795 is a `hidden beast` number, since 645 + 7 + 9 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (645787) and next prime (645803).

It is not a de Polignac number, because 645795 - 2³ = 645787 is a prime.

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5022 + ... + 5148.

It is an arithmetic number, because the mean of its divisors is an integer number (47424).

2⁶⁴⁵⁷⁹⁵ is an apocalyptic number.

645795 is a deficient number, since it is larger than the sum of its proper divisors (492381).

645795 is a wasteful number, since it uses less digits than its factorization.

645795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251 (or 248 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 645795 is about 803.6137131732. The cubic root of 645795 is about 86.4367095807.

The spelling of 645795 in words is "six hundred forty-five thousand, seven hundred ninety-five".