28081803766 has 4 divisors (see below), whose sum is σ = 42122705652. Its totient is φ = 14040901882.

The previous prime is 28081803691. The next prime is 28081803767. The reversal of 28081803766 is 66730818082.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28081803767) 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 as a sum of consecutive naturals, namely, 7020450940 + ... + 7020450943.

It is an arithmetic number, because the mean of its divisors is an integer number (10530676413).

Almost surely, 2^28081803766 is an apocalyptic number.

28081803766 is a deficient number, since it is larger than the sum of its proper divisors (14040901886).

28081803766 is a wasteful number, since it uses less digits than its factorization.

28081803766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14040901885.

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 28081803766 in words is "twenty-eight billion, eighty-one million, eight hundred three thousand, seven hundred sixty-six".