28748556 has 72 divisors (see below), whose sum is σ = 75688704. Its totient is φ = 9192960.

The previous prime is 28748543. The next prime is 28748579. The reversal of 28748556 is 65584782.

28748556 is a `hidden beast` number, since 28 + 74 + 8 + 556 = 666.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 150421 + ... + 150611.

It is an arithmetic number, because the mean of its divisors is an integer number (1051232).

Almost surely, 2^28748556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28748556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37844352).

28748556 is an abundant number, since it is smaller than the sum of its proper divisors (46940148).

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

28748556 is a wasteful number, since it uses less digits than its factorization.

28748556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351 (or 346 counting only the distinct ones).

The product of its digits is 537600, while the sum is 45.

The square root of 28748556 is about 5361.7679919967. The cubic root of 28748556 is about 306.3411548172.

The spelling of 28748556 in words is "twenty-eight million, seven hundred forty-eight thousand, five hundred fifty-six".