28357129 has 4 divisors (see below), whose sum is σ = 28716160. Its totient is φ = 27998100.

The previous prime is 28357127. The next prime is 28357141. The reversal of 28357129 is 92175382.

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.

It is a cyclic number.

It is not a de Polignac number, because 28357129 - 2¹ = 28357127 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28357127) 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, 179397 + ... + 179554.

It is an arithmetic number, because the mean of its divisors is an integer number (7179040).

Almost surely, 2^28357129 is an apocalyptic number.

It is an amenable number.

28357129 is a deficient number, since it is larger than the sum of its proper divisors (359031).

28357129 is an equidigital number, since it uses as much as digits as its factorization.

28357129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359030.

The product of its digits is 30240, while the sum is 37.

The square root of 28357129 is about 5325.1412187847. The cubic root of 28357129 is about 304.9444635960.

The spelling of 28357129 in words is "twenty-eight million, three hundred fifty-seven thousand, one hundred twenty-nine".