27728630478 has 64 divisors (see below), whose sum is σ = 61959744000. Its totient is φ = 9191905920.

The previous prime is 27728630441. The next prime is 27728630483. The reversal of 27728630478 is 87403682772.

27728630478 is a `hidden beast` number, since 27 + 72 + 86 + 3 + 0 + 478 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

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 in 31 ways as a sum of consecutive naturals, for example, 18205825 + ... + 18207347.

It is an arithmetic number, because the mean of its divisors is an integer number (968121000).

Almost surely, 2^27728630478 is an apocalyptic number.

27728630478 is an abundant number, since it is smaller than the sum of its proper divisors (34231113522).

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

27728630478 is a wasteful number, since it uses less digits than its factorization.

27728630478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3174 (or 3168 counting only the distinct ones).

The product of its (nonzero) digits is 6322176, while the sum is 54.

The spelling of 27728630478 in words is "twenty-seven billion, seven hundred twenty-eight million, six hundred thirty thousand, four hundred seventy-eight".