28032686865778 has 32 divisors (see below), whose sum is σ = 50727693168000. Its totient is φ = 11599732487952.

The previous prime is 28032686865769. The next prime is 28032686865791. The reversal of 28032686865778 is 87756868623082.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 704531400 + ... + 704571187.

It is an arithmetic number, because the mean of its divisors is an integer number (1585240411500).

Almost surely, 2^{28032686865778} is an apocalyptic number.

28032686865778 is a deficient number, since it is larger than the sum of its proper divisors (22695006302222).

28032686865778 is a wasteful number, since it uses less digits than its factorization.

28032686865778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409102639 (or 1409102625 counting only the distinct ones).

The product of its (nonzero) digits is 2601123840, while the sum is 76.

The spelling of 28032686865778 in words is "twenty-eight trillion, thirty-two billion, six hundred eighty-six million, eight hundred sixty-five thousand, seven hundred seventy-eight".