28220075 has 24 divisors (see below), whose sum is σ = 38914176. Its totient is φ = 20160000.

The previous prime is 28220041. The next prime is 28220081. The reversal of 28220075 is 57002282.

It is a de Polignac number, because none of the positive numbers 2^k-28220075 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8675 + ... + 11475.

It is an arithmetic number, because the mean of its divisors is an integer number (1621424).

Almost surely, 2^28220075 is an apocalyptic number.

28220075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28220075 is a deficient number, since it is larger than the sum of its proper divisors (10694101).

28220075 is a wasteful number, since it uses less digits than its factorization.

28220075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2855 (or 2850 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 28220075 is about 5312.2570532684. The cubic root of 28220075 is about 304.4523901358.

The spelling of 28220075 in words is "twenty-eight million, two hundred twenty thousand, seventy-five".