645221034 has 24 divisors (see below), whose sum is σ = 1420899012. Its totient is φ = 211547520.

The previous prime is 645221023. The next prime is 645221069. The reversal of 645221034 is 430122546.

645221034 is a `hidden beast` number, since 645 + 2 + 2 + 10 + 3 + 4 = 666.

645221034 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 440874009 + 204347025 = 20997^2 + 14295^2 .

It is a junction number, because it is equal to n+sod(n) for n = 645220989 and 645221007.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 292719 + ... + 294914.

Almost surely, 2^645221034 is an apocalyptic number.

645221034 is an abundant number, since it is smaller than the sum of its proper divisors (775677978).

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

645221034 is a wasteful number, since it uses less digits than its factorization.

645221034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587702 (or 587699 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 645221034 is about 25401.2014282789. The cubic root of 645221034 is about 864.1109441510.

It can be divided in two parts, 64522 and 1034, that added together give a palindrome (65556).

The spelling of 645221034 in words is "six hundred forty-five million, two hundred twenty-one thousand, thirty-four".