28229031 has 12 divisors (see below), whose sum is σ = 41444520. Its totient is φ = 18510480.

The previous prime is 28229011. The next prime is 28229051. The reversal of 28229031 is 13092282.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28229011) and next prime (28229051).

It is not a de Polignac number, because 28229031 - 2²² = 24034727 is a prime.

It is a super-2 number, since 2×28229031² = 1593756382397922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28228986 and 28229004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28229011) 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 11 ways as a sum of consecutive naturals, for example, 25161 + ... + 26258.

It is an arithmetic number, because the mean of its divisors is an integer number (3453710).

Almost surely, 2^28229031 is an apocalyptic number.

28229031 is a deficient number, since it is larger than the sum of its proper divisors (13215489).

28229031 is a wasteful number, since it uses less digits than its factorization.

28229031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51486 (or 51483 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 28229031 is about 5313.0999425947. The cubic root of 28229031 is about 304.4845940097.

The spelling of 28229031 in words is "twenty-eight million, two hundred twenty-nine thousand, thirty-one".