645382127 has 8 divisors (see below), whose sum is σ = 695520000. Its totient is φ = 595314720.

The previous prime is 645382109. The next prime is 645382159. The reversal of 645382127 is 721283546.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645382127 - 2⁸ = 645381871 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 (645582127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2249 + ... + 35997.

It is an arithmetic number, because the mean of its divisors is an integer number (86940000).

Almost surely, 2^645382127 is an apocalyptic number.

645382127 is a deficient number, since it is larger than the sum of its proper divisors (50137873).

645382127 is a wasteful number, since it uses less digits than its factorization.

645382127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35233.

The product of its digits is 80640, while the sum is 38.

The square root of 645382127 is about 25404.3722024379. The cubic root of 645382127 is about 864.1828526566.

The spelling of 645382127 in words is "six hundred forty-five million, three hundred eighty-two thousand, one hundred twenty-seven".