28639783892 has 6 divisors (see below), whose sum is σ = 50119621818. Its totient is φ = 14319891944.

The previous prime is 28639783883. The next prime is 28639783897. The reversal of 28639783892 is 29838793682.

It can be written as a sum of positive squares in only one way, i.e., 22035621136 + 6604162756 = 148444^2 + 81266^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28639783897) 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, 3579972983 + ... + 3579972990.

It is an arithmetic number, because the mean of its divisors is an integer number (8353270303).

Almost surely, 2^28639783892 is an apocalyptic number.

It is an amenable number.

28639783892 is a deficient number, since it is larger than the sum of its proper divisors (21479837926).

28639783892 is a wasteful number, since it uses less digits than its factorization.

28639783892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7159945977 (or 7159945975 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 65.

The spelling of 28639783892 in words is "twenty-eight billion, six hundred thirty-nine million, seven hundred eighty-three thousand, eight hundred ninety-two".