28173869428656 has 80 divisors (see below), whose sum is σ = 83181513542400. Its totient is φ = 8049530068224.

The previous prime is 28173869428637. The next prime is 28173869428739. The reversal of 28173869428656 is 65682496837182.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18384715 + ... + 19858133.

It is an arithmetic number, because the mean of its divisors is an integer number (1039768919280).

Almost surely, 2^{28173869428656} is an apocalyptic number.

It is an amenable number.

28173869428656 is an abundant number, since it is smaller than the sum of its proper divisors (55007644113744).

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

28173869428656 is a wasteful number, since it uses less digits than its factorization.

28173869428656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1530346 (or 1530340 counting only the distinct ones).

The product of its digits is 1672151040, while the sum is 75.

The spelling of 28173869428656 in words is "twenty-eight trillion, one hundred seventy-three billion, eight hundred sixty-nine million, four hundred twenty-eight thousand, six hundred fifty-six".