645285022 has 4 divisors (see below), whose sum is σ = 967927536. Its totient is φ = 322642510.

The previous prime is 645285013. The next prime is 645285037. The reversal of 645285022 is 220582546.

645285022 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161321254 + ... + 161321257.

It is an arithmetic number, because the mean of its divisors is an integer number (241981884).

Almost surely, 2^645285022 is an apocalyptic number.

645285022 is a deficient number, since it is larger than the sum of its proper divisors (322642514).

645285022 is a wasteful number, since it uses less digits than its factorization.

645285022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322642513.

The product of its (nonzero) digits is 38400, while the sum is 34.

The square root of 645285022 is about 25402.4609437747. The cubic root of 645285022 is about 864.1395084726.

The spelling of 645285022 in words is "six hundred forty-five million, two hundred eighty-five thousand, twenty-two".