28240275 has 24 divisors (see below), whose sum is σ = 53361664. Its totient is φ = 12909600.

The previous prime is 28240273. The next prime is 28240301. The reversal of 28240275 is 57204282.

It is not a de Polignac number, because 28240275 - 2¹ = 28240273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28240273) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26371 + ... + 27420.

Almost surely, 2^28240275 is an apocalyptic number.

28240275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28240275 is a deficient number, since it is larger than the sum of its proper divisors (25121389).

28240275 is a wasteful number, since it uses less digits than its factorization.

28240275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53811 (or 53806 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 28240275 is about 5314.1579765754. The cubic root of 28240275 is about 304.5250154033.

The spelling of 28240275 in words is "twenty-eight million, two hundred forty thousand, two hundred seventy-five".