645884522 has 8 divisors (see below), whose sum is σ = 970140000. Its totient is φ = 322504524.

The previous prime is 645884513. The next prime is 645884527. The reversal of 645884522 is 225488546.

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

It is not an unprimeable number, because it can be changed into a prime (645884527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217022 + ... + 219977.

It is an arithmetic number, because the mean of its divisors is an integer number (121267500).

Almost surely, 2^645884522 is an apocalyptic number.

645884522 is a deficient number, since it is larger than the sum of its proper divisors (324255478).

645884522 is a wasteful number, since it uses less digits than its factorization.

645884522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437740.

The product of its digits is 614400, while the sum is 44.

The square root of 645884522 is about 25414.2582421758. The cubic root of 645884522 is about 864.4070343301.

The spelling of 645884522 in words is "six hundred forty-five million, eight hundred eighty-four thousand, five hundred twenty-two".