28056420 has 108 divisors (see below), whose sum is σ = 99030204. Its totient is φ = 6410880.

The previous prime is 28056419. The next prime is 28056421. The reversal of 28056420 is 2465082.

28056420 is a `hidden beast` number, since 2 + 80 + 564 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (28056419) and next prime (28056421).

It can be written as a sum of positive squares in 2 ways, for example, as 5531904 + 22524516 = 2352^2 + 4746^2 .

It is not an unprimeable number, because it can be changed into a prime (28056421) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7230 + ... + 10410.

Almost surely, 2^28056420 is an apocalyptic number.

28056420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28056420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49515102).

28056420 is an abundant number, since it is smaller than the sum of its proper divisors (70973784).

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

28056420 is a wasteful number, since it uses less digits than its factorization.

28056420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3210 (or 3198 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 28056420 is about 5296.8311281369. The cubic root of 28056420 is about 303.8627179085.

The spelling of 28056420 in words is "twenty-eight million, fifty-six thousand, four hundred twenty".