28228540 has 12 divisors (see below), whose sum is σ = 59279976. Its totient is φ = 11291408.

The previous prime is 28228523. The next prime is 28228553. The reversal of 28228540 is 4582282.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705694 + ... + 705733.

It is an arithmetic number, because the mean of its divisors is an integer number (4939998).

Almost surely, 2^28228540 is an apocalyptic number.

28228540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28228540 is an abundant number, since it is smaller than the sum of its proper divisors (31051436).

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

28228540 is a wasteful number, since it uses less digits than its factorization.

28228540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411436 (or 1411434 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 31.

The square root of 28228540 is about 5313.0537358472. The cubic root of 28228540 is about 304.4828286545.

The spelling of 28228540 in words is "twenty-eight million, two hundred twenty-eight thousand, five hundred forty".