645713875 has 8 divisors (see below), whose sum is σ = 805851072. Its totient is φ = 516571000.

The previous prime is 645713857. The next prime is 645713897. The reversal of 645713875 is 578317546.

It is not a de Polignac number, because 645713875 - 2¹⁵ = 645681107 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2582731 + ... + 2582980.

It is an arithmetic number, because the mean of its divisors is an integer number (100731384).

Almost surely, 2^645713875 is an apocalyptic number.

645713875 is a deficient number, since it is larger than the sum of its proper divisors (160137197).

645713875 is an equidigital number, since it uses as much as digits as its factorization.

645713875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5165726 (or 5165716 counting only the distinct ones).

The product of its digits is 705600, while the sum is 46.

The square root of 645713875 is about 25410.9007120960. The cubic root of 645713875 is about 864.3309002561.

The spelling of 645713875 in words is "six hundred forty-five million, seven hundred thirteen thousand, eight hundred seventy-five".