645887162 has 4 divisors (see below), whose sum is σ = 968830746. Its totient is φ = 322943580.

The previous prime is 645887153. The next prime is 645887189. The reversal of 645887162 is 261788546.

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

It can be written as a sum of positive squares in only one way, i.e., 553707961 + 92179201 = 23531^2 + 9601^2 .

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 as a sum of consecutive naturals, namely, 161471789 + ... + 161471792.

Almost surely, 2^645887162 is an apocalyptic number.

645887162 is a deficient number, since it is larger than the sum of its proper divisors (322943584).

645887162 is a wasteful number, since it uses less digits than its factorization.

645887162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322943583.

The product of its digits is 645120, while the sum is 47.

The square root of 645887162 is about 25414.3101814706. The cubic root of 645887162 is about 864.4082120595.

The spelling of 645887162 in words is "six hundred forty-five million, eight hundred eighty-seven thousand, one hundred sixty-two".