28951225 has 12 divisors (see below), whose sum is σ = 36002284. Its totient is φ = 23094720.

The previous prime is 28951217. The next prime is 28951229. The reversal of 28951225 is 52215982.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 2849344 + 26101881 = 1688^2 + 5109^2 .

It is not a de Polignac number, because 28951225 - 2³ = 28951217 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28951229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8467 + ... + 11383.

Almost surely, 2^28951225 is an apocalyptic number.

28951225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28951225 is a deficient number, since it is larger than the sum of its proper divisors (7051059).

28951225 is a wasteful number, since it uses less digits than its factorization.

28951225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3324 (or 3319 counting only the distinct ones).

The product of its digits is 14400, while the sum is 34.

The square root of 28951225 is about 5380.6342562936. The cubic root of 28951225 is about 307.0593419436.

The spelling of 28951225 in words is "twenty-eight million, nine hundred fifty-one thousand, two hundred twenty-five".