1813779768 has 32 divisors (see below), whose sum is σ = 4535688960. Its totient is φ = 604428000.

The previous prime is 1813779761. The next prime is 1813779769. The reversal of 1813779768 is 8679773181.

It is a super-2 number, since 2×1813779768² = 6579594093612267648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813779761) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 106071 + ... + 121977.

It is an arithmetic number, because the mean of its divisors is an integer number (141740280).

Almost surely, 2^1813779768 is an apocalyptic number.

It is an amenable number.

1813779768 is an abundant number, since it is smaller than the sum of its proper divisors (2721909192).

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

1813779768 is a wasteful number, since it uses less digits than its factorization.

1813779768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20667 (or 20663 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 57.

The square root of 1813779768 is about 42588.4933755586. The cubic root of 1813779768 is about 1219.5366349259.

The spelling of 1813779768 in words is "one billion, eight hundred thirteen million, seven hundred seventy-nine thousand, seven hundred sixty-eight".