28226840 has 32 divisors (see below), whose sum is σ = 63672480. Its totient is φ = 11261952.

The previous prime is 28226827. The next prime is 28226843. The reversal of 28226840 is 4862282.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28226797 and 28226806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28226843) 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 7 ways as a sum of consecutive naturals, for example, 22469 + ... + 23691.

It is an arithmetic number, because the mean of its divisors is an integer number (1989765).

Almost surely, 2^28226840 is an apocalyptic number.

28226840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28226840 is an abundant number, since it is smaller than the sum of its proper divisors (35445640).

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

28226840 is a wasteful number, since it uses less digits than its factorization.

28226840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1811 (or 1807 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 28226840 is about 5312.8937501140. The cubic root of 28226840 is about 304.4767162685.

The spelling of 28226840 in words is "twenty-eight million, two hundred twenty-six thousand, eight hundred forty".