28280540 has 12 divisors (see below), whose sum is σ = 59389176. Its totient is φ = 11312208.

The previous prime is 28280491. The next prime is 28280563. The reversal of 28280540 is 4508282.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 706994 + ... + 707033.

It is an arithmetic number, because the mean of its divisors is an integer number (4949098).

Almost surely, 2^28280540 is an apocalyptic number.

28280540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28280540 is an abundant number, since it is smaller than the sum of its proper divisors (31108636).

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

28280540 is a wasteful number, since it uses less digits than its factorization.

28280540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414036 (or 1414034 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 29.

The square root of 28280540 is about 5317.9450918564. The cubic root of 28280540 is about 304.6696773182.

The spelling of 28280540 in words is "twenty-eight million, two hundred eighty thousand, five hundred forty".