28055177486478 has 48 divisors (see below), whose sum is σ = 64011967503120. Its totient is φ = 8855863964928.

The previous prime is 28055177486417. The next prime is 28055177486513. The reversal of 28055177486478 is 87468477155082.

28055177486478 is a `hidden beast` number, since 2 + 8 + 0 + 5 + 5 + 1 + 7 + 74 + 86 + 478 = 666.

It is a congruent number.

It is an unprimeable number.

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 in 23 ways as a sum of consecutive naturals, for example, 16143325 + ... + 17796552.

It is an arithmetic number, because the mean of its divisors is an integer number (1333582656315).

Almost surely, 2^{28055177486478} is an apocalyptic number.

28055177486478 is an abundant number, since it is smaller than the sum of its proper divisors (35956790016642).

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

28055177486478 is a wasteful number, since it uses less digits than its factorization.

28055177486478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33942321 (or 33942318 counting only the distinct ones).

The product of its (nonzero) digits is 842956800, while the sum is 72.

The spelling of 28055177486478 in words is "twenty-eight trillion, fifty-five billion, one hundred seventy-seven million, four hundred eighty-six thousand, four hundred seventy-eight".