1812644128 has 48 divisors (see below), whose sum is σ = 3604104504. Its totient is φ = 897361920.

The previous prime is 1812644117. The next prime is 1812644179. The reversal of 1812644128 is 8214462181.

It can be written as a sum of positive squares in 4 ways, for example, as 1231448464 + 581195664 = 35092^2 + 24108^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2114676 + ... + 2115532.

Almost surely, 2^1812644128 is an apocalyptic number.

It is an amenable number.

1812644128 is a deficient number, since it is larger than the sum of its proper divisors (1791460376).

1812644128 is a wasteful number, since it uses less digits than its factorization.

1812644128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1445 (or 1437 counting only the distinct ones).

The product of its digits is 24576, while the sum is 37.

The square root of 1812644128 is about 42575.1585786829. The cubic root of 1812644128 is about 1219.2820572097.

The spelling of 1812644128 in words is "one billion, eight hundred twelve million, six hundred forty-four thousand, one hundred twenty-eight".