28671225 has 48 divisors (see below), whose sum is σ = 53996544. Its totient is φ = 13288000.

The previous prime is 28671217. The next prime is 28671229. The reversal of 28671225 is 52217682.

It is not a de Polignac number, because 28671225 - 2³ = 28671217 is a prime.

It is a super-3 number, since 3×28671225³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28671229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18220 + ... + 19730.

It is an arithmetic number, because the mean of its divisors is an integer number (1124928).

Almost surely, 2^28671225 is an apocalyptic number.

28671225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28671225 is a deficient number, since it is larger than the sum of its proper divisors (25325319).

28671225 is a wasteful number, since it uses less digits than its factorization.

28671225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1558 (or 1553 counting only the distinct ones).

The product of its digits is 13440, while the sum is 33.

The square root of 28671225 is about 5354.5518019719. The cubic root of 28671225 is about 306.0662315519.

The spelling of 28671225 in words is "twenty-eight million, six hundred seventy-one thousand, two hundred twenty-five".