28986225 has 24 divisors (see below), whose sum is σ = 49580160. Its totient is φ = 14925120.

The previous prime is 28986211. The next prime is 28986227. The reversal of 28986225 is 52268982.

28986225 = 241² + 242² + ... + 465².

It is not a de Polignac number, because 28986225 - 2¹⁸ = 28724081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28986227) 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, 4489 + ... + 8838.

It is an arithmetic number, because the mean of its divisors is an integer number (2065840).

Almost surely, 2^28986225 is an apocalyptic number.

28986225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28986225 is a deficient number, since it is larger than the sum of its proper divisors (20593935).

28986225 is a wasteful number, since it uses less digits than its factorization.

28986225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13369 (or 13364 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The square root of 28986225 is about 5383.8856785783. The cubic root of 28986225 is about 307.1830298480.

The spelling of 28986225 in words is "twenty-eight million, nine hundred eighty-six thousand, two hundred twenty-five".