28747556 has 18 divisors (see below), whose sum is σ = 51102198. Its totient is φ = 14150400.

The previous prime is 28747553. The next prime is 28747567. The reversal of 28747556 is 65574782.

It can be written as a sum of positive squares in only one way, i.e., 28729600 + 17956 = 5360^2 + 134^2 .

It is not an unprimeable number, because it can be changed into a prime (28747553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17156 + ... + 18756.

It is an arithmetic number, because the mean of its divisors is an integer number (2839011).

Almost surely, 2^28747556 is an apocalyptic number.

It is an amenable number.

28747556 is a deficient number, since it is larger than the sum of its proper divisors (22354642).

28747556 is a wasteful number, since it uses less digits than its factorization.

28747556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1739 (or 1670 counting only the distinct ones).

The product of its digits is 470400, while the sum is 44.

The square root of 28747556 is about 5361.6747383630. The cubic root of 28747556 is about 306.3376028161.

The spelling of 28747556 in words is "twenty-eight million, seven hundred forty-seven thousand, five hundred fifty-six".