28389056 has 56 divisors (see below), whose sum is σ = 59740800. Its totient is φ = 13363200.

The previous prime is 28389047. The next prime is 28389083. The reversal of 28389056 is 65098382.

It is a super-2 number, since 2×28389056² = 1611877001142272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81170 + ... + 81518.

It is an arithmetic number, because the mean of its divisors is an integer number (1066800).

Almost surely, 2^28389056 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 28389056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29870400).

28389056 is an abundant number, since it is smaller than the sum of its proper divisors (31351744).

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

28389056 is a wasteful number, since it uses less digits than its factorization.

28389056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433 (or 423 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 28389056 is about 5328.1381363474. The cubic root of 28389056 is about 305.0588652843.

The spelling of 28389056 in words is "twenty-eight million, three hundred eighty-nine thousand, fifty-six".