28851225 has 48 divisors (see below), whose sum is σ = 51996672. Its totient is φ = 14031360.

The previous prime is 28851217. The next prime is 28851247. The reversal of 28851225 is 52215882.

It is not a de Polignac number, because 28851225 - 2³ = 28851217 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 123709 + ... + 123941.

It is an arithmetic number, because the mean of its divisors is an integer number (1083264).

Almost surely, 2^28851225 is an apocalyptic number.

28851225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28851225 is a deficient number, since it is larger than the sum of its proper divisors (23145447).

28851225 is a wasteful number, since it uses less digits than its factorization.

28851225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 381 counting only the distinct ones).

The product of its digits is 12800, while the sum is 33.

The square root of 28851225 is about 5371.3336332795. Note that the first 3 decimals coincide. The cubic root of 28851225 is about 306.7053977284.

The spelling of 28851225 in words is "twenty-eight million, eight hundred fifty-one thousand, two hundred twenty-five".