28417229 has 4 divisors (see below), whose sum is σ = 28447584. Its totient is φ = 28386876.

The previous prime is 28417219. The next prime is 28417231. The reversal of 28417229 is 92271482.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92271482 = 2 ⋅46135741.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28417229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28417219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13727 + ... + 15660.

It is an arithmetic number, because the mean of its divisors is an integer number (7111896).

Almost surely, 2^28417229 is an apocalyptic number.

It is an amenable number.

28417229 is a deficient number, since it is larger than the sum of its proper divisors (30355).

28417229 is an equidigital number, since it uses as much as digits as its factorization.

28417229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30354.

The product of its digits is 16128, while the sum is 35.

The square root of 28417229 is about 5330.7812748227. The cubic root of 28417229 is about 305.1597443222.

The spelling of 28417229 in words is "twenty-eight million, four hundred seventeen thousand, two hundred twenty-nine".