28181818738 has 16 divisors (see below), whose sum is σ = 42654677760. Its totient is φ = 13963638976.

The previous prime is 28181818733. The next prime is 28181818747. The reversal of 28181818738 is 83781818182.

It is not an unprimeable number, because it can be changed into a prime (28181818733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1983303 + ... + 1997461.

It is an arithmetic number, because the mean of its divisors is an integer number (2665917360).

Almost surely, 2^28181818738 is an apocalyptic number.

28181818738 is a deficient number, since it is larger than the sum of its proper divisors (14472859022).

28181818738 is a wasteful number, since it uses less digits than its factorization.

28181818738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23081.

The product of its digits is 1376256, while the sum is 55.

The spelling of 28181818738 in words is "twenty-eight billion, one hundred eighty-one million, eight hundred eighteen thousand, seven hundred thirty-eight".