18856782090 has 24 divisors (see below), whose sum is σ = 49027633668. Its totient is φ = 5028475200.

The previous prime is 18856782079. The next prime is 18856782181. The reversal of 18856782090 is 9028765881.

It can be written as a sum of positive squares in 2 ways, for example, as 18818626761 + 38155329 = 137181^2 + 6177^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104759811 + ... + 104759990.

Almost surely, 2^18856782090 is an apocalyptic number.

18856782090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18856782090 is an abundant number, since it is smaller than the sum of its proper divisors (30170851578).

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

18856782090 is a wasteful number, since it uses less digits than its factorization.

18856782090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209519814 (or 209519811 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 54.

The spelling of 18856782090 in words is "eighteen billion, eight hundred fifty-six million, seven hundred eighty-two thousand, ninety".