27728747826 has 32 divisors (see below), whose sum is σ = 60994176768. Its totient is φ = 8350391040.

The previous prime is 27728747807. The next prime is 27728747831. The reversal of 27728747826 is 62874782772.

It is a self number, because there is not a number n which added to its sum of digits gives 27728747826.

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 15 ways as a sum of consecutive naturals, for example, 3778215 + ... + 3785546.

It is an arithmetic number, because the mean of its divisors is an integer number (1906068024).

Almost surely, 2^27728747826 is an apocalyptic number.

27728747826 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

27728747826 is an abundant number, since it is smaller than the sum of its proper divisors (33265428942).

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

27728747826 is a wasteful number, since it uses less digits than its factorization.

27728747826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7563826.

The product of its digits is 29503488, while the sum is 60.

The spelling of 27728747826 in words is "twenty-seven billion, seven hundred twenty-eight million, seven hundred forty-seven thousand, eight hundred twenty-six".