28939225 has 12 divisors (see below), whose sum is σ = 41011264. Its totient is φ = 19843920.

The previous prime is 28939199. The next prime is 28939231. The reversal of 28939225 is 52293982.

It is not a de Polignac number, because 28939225 - 2¹¹ = 28937177 is a prime.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82509 + ... + 82858.

Almost surely, 2^28939225 is an apocalyptic number.

28939225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28939225 is a deficient number, since it is larger than the sum of its proper divisors (12072039).

28939225 is a wasteful number, since it uses less digits than its factorization.

28939225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165384 (or 165379 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 28939225 is about 5379.5190305454. The cubic root of 28939225 is about 307.0169117147.

The spelling of 28939225 in words is "twenty-eight million, nine hundred thirty-nine thousand, two hundred twenty-five".