27728747828 has 12 divisors (see below), whose sum is σ = 48533617860. Its totient is φ = 13861999872.

The previous prime is 27728747807. The next prime is 27728747831. The reversal of 27728747828 is 82874782772.

It can be written as a sum of positive squares in 2 ways, for example, as 2858827024 + 24869920804 = 53468^2 + 157702^2 .

It is a super-2 number, since 2×27728747828² (a number of 22 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 567101 + ... + 614052.

It is an arithmetic number, because the mean of its divisors is an integer number (4044468155).

Almost surely, 2^27728747828 is an apocalyptic number.

It is an amenable number.

27728747828 is a deficient number, since it is larger than the sum of its proper divisors (20804870032).

27728747828 is a wasteful number, since it uses less digits than its factorization.

27728747828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187026 (or 1187024 counting only the distinct ones).

The product of its digits is 39337984, while the sum is 62.

The spelling of 27728747828 in words is "twenty-seven billion, seven hundred twenty-eight million, seven hundred forty-seven thousand, eight hundred twenty-eight".