18780056 has 16 divisors (see below), whose sum is σ = 37066200. Its totient is φ = 8895744.

The previous prime is 18780043. The next prime is 18780059. The reversal of 18780056 is 65008781.

It is a happy number.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18779998 and 18780025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18780059) 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 3 ways as a sum of consecutive naturals, for example, 61625 + ... + 61928.

Almost surely, 2^18780056 is an apocalyptic number.

It is an amenable number.

18780056 is a deficient number, since it is larger than the sum of its proper divisors (18286144).

18780056 is a wasteful number, since it uses less digits than its factorization.

18780056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123578 (or 123574 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 18780056 is about 4333.5961971554. The cubic root of 18780056 is about 265.8065188071.

The spelling of 18780056 in words is "eighteen million, seven hundred eighty thousand, fifty-six".