28978255686 has 16 divisors (see below), whose sum is σ = 58107838464. Its totient is φ = 9634197384.

The previous prime is 28978255661. The next prime is 28978255687. The reversal of 28978255686 is 68655287982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28978255687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6302806 + ... + 6307401.

It is an arithmetic number, because the mean of its divisors is an integer number (3631739904).

Almost surely, 2^28978255686 is an apocalyptic number.

28978255686 is an abundant number, since it is smaller than the sum of its proper divisors (29129582778).

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

28978255686 is a wasteful number, since it uses less digits than its factorization.

28978255686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12610595.

The product of its digits is 116121600, while the sum is 66.

The spelling of 28978255686 in words is "twenty-eight billion, nine hundred seventy-eight million, two hundred fifty-five thousand, six hundred eighty-six".