28105056 has 120 divisors (see below), whose sum is σ = 94525200. Its totient is φ = 8024832.

The previous prime is 28105019. The next prime is 28105069. The reversal of 28105056 is 65050182.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17370 + ... + 18918.

It is an arithmetic number, because the mean of its divisors is an integer number (787710).

Almost surely, 2^28105056 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 28105056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47262600).

28105056 is an abundant number, since it is smaller than the sum of its proper divisors (66420144).

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

28105056 is a wasteful number, since it uses less digits than its factorization.

28105056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578 (or 1561 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 28105056 is about 5301.4201870819. The cubic root of 28105056 is about 304.0381992626.

The spelling of 28105056 in words is "twenty-eight million, one hundred five thousand, fifty-six".