28230840 has 96 divisors (see below), whose sum is σ = 100105200. Its totient is φ = 6842880.

The previous prime is 28230793. The next prime is 28230847. The reversal of 28230840 is 4803282.

28230840 = T₂₇₉ + T₂₈₀ + ... + T₅₇₅.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28230847) 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 23 ways as a sum of consecutive naturals, for example, 396 + ... + 7524.

Almost surely, 2^28230840 is an apocalyptic number.

28230840 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 28230840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50052600).

28230840 is an abundant number, since it is smaller than the sum of its proper divisors (71874360).

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

28230840 is a wasteful number, since it uses less digits than its factorization.

28230840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7157 (or 7150 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 28230840 is about 5313.2701794657. The cubic root of 28230840 is about 304.4910979626.

The spelling of 28230840 in words is "twenty-eight million, two hundred thirty thousand, eight hundred forty".