645889284 has 36 divisors (see below), whose sum is σ = 1660342320. Its totient is φ = 211646640.

The previous prime is 645889271. The next prime is 645889297. The reversal of 645889284 is 482988546.

It is an interprime number because it is at equal distance from previous prime (645889271) and next prime (645889297).

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 645889284.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149922 + ... + 154169.

It is an arithmetic number, because the mean of its divisors is an integer number (46120620).

Almost surely, 2^645889284 is an apocalyptic number.

It is an amenable number.

645889284 is an abundant number, since it is smaller than the sum of its proper divisors (1014453036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645889284 is a wasteful number, since it uses less digits than its factorization.

645889284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304160 (or 304155 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 54.

The square root of 645889284 is about 25414.3519295692. The cubic root of 645889284 is about 864.4091587017.

The spelling of 645889284 in words is "six hundred forty-five million, eight hundred eighty-nine thousand, two hundred eighty-four".