28125220 has 24 divisors (see below), whose sum is σ = 59298624. Its totient is φ = 11205216.

The previous prime is 28125203. The next prime is 28125233. The reversal of 28125220 is 2252182.

It is a junction number, because it is equal to n+sod(n) for n = 28125191 and 28125200.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2587 + ... + 7933.

It is an arithmetic number, because the mean of its divisors is an integer number (2470776).

Almost surely, 2^28125220 is an apocalyptic number.

28125220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28125220 is an abundant number, since it is smaller than the sum of its proper divisors (31173404).

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

28125220 is a wasteful number, since it uses less digits than its factorization.

28125220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5619 (or 5617 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 28125220 is about 5303.3216006575. The cubic root of 28125220 is about 304.1108927155.

The spelling of 28125220 in words is "twenty-eight million, one hundred twenty-five thousand, two hundred twenty".