1813672144 has 20 divisors (see below), whose sum is σ = 3516113124. Its totient is φ = 906288128.

The previous prime is 1813672057. The next prime is 1813672177. The reversal of 1813672144 is 4412763181.

It can be written as a sum of positive squares in 2 ways, for example, as 1162810000 + 650862144 = 34100^2 + 25512^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6247 + ... + 60550.

Almost surely, 2^1813672144 is an apocalyptic number.

It is an amenable number.

1813672144 is a deficient number, since it is larger than the sum of its proper divisors (1702440980).

1813672144 is a wasteful number, since it uses less digits than its factorization.

1813672144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68502 (or 68496 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 1813672144 is about 42587.2298230350. The cubic root of 1813672144 is about 1219.5125132898.

The spelling of 1813672144 in words is "one billion, eight hundred thirteen million, six hundred seventy-two thousand, one hundred forty-four".