28219129 has 4 divisors (see below), whose sum is σ = 28819584. Its totient is φ = 27618676.

The previous prime is 28219073. The next prime is 28219153. The reversal of 28219129 is 92191282.

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: 92191282 = 2 ⋅46095641.

It is a cyclic number.

It is not a de Polignac number, because 28219129 - 2²³ = 19830521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28219094 and 28219103.

It is not an unprimeable number, because it can be changed into a prime (28219189) 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, 300157 + ... + 300250.

It is an arithmetic number, because the mean of its divisors is an integer number (7204896).

Almost surely, 2^28219129 is an apocalyptic number.

It is an amenable number.

28219129 is a deficient number, since it is larger than the sum of its proper divisors (600455).

28219129 is an equidigital number, since it uses as much as digits as its factorization.

28219129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600454.

The product of its digits is 5184, while the sum is 34.

The square root of 28219129 is about 5312.1680131562. The cubic root of 28219129 is about 304.4489881229.

The spelling of 28219129 in words is "twenty-eight million, two hundred nineteen thousand, one hundred twenty-nine".