28181766754 has 4 divisors (see below), whose sum is σ = 42272650134. Its totient is φ = 14090883376.

The previous prime is 28181766751. The next prime is 28181766787. The reversal of 28181766754 is 45766718182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16833765025 + 11348001729 = 129745^2 + 106527^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28181766695 and 28181766704.

It is not an unprimeable number, because it can be changed into a prime (28181766751) by changing a digit.

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 as a sum of consecutive naturals, namely, 7045441687 + ... + 7045441690.

Almost surely, 2^28181766754 is an apocalyptic number.

28181766754 is a deficient number, since it is larger than the sum of its proper divisors (14090883380).

28181766754 is a wasteful number, since it uses less digits than its factorization.

28181766754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14090883379.

The product of its digits is 4515840, while the sum is 55.

The spelling of 28181766754 in words is "twenty-eight billion, one hundred eighty-one million, seven hundred sixty-six thousand, seven hundred fifty-four".