28129349 has 4 divisors (see below), whose sum is σ = 28174560. Its totient is φ = 28084140.

The previous prime is 28129301. The next prime is 28129393. The reversal of 28129349 is 94392182.

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 28129349 - 2⁸ = 28129093 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 (28129249) 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, 21659 + ... + 22920.

It is an arithmetic number, because the mean of its divisors is an integer number (7043640).

Almost surely, 2^28129349 is an apocalyptic number.

It is an amenable number.

28129349 is a deficient number, since it is larger than the sum of its proper divisors (45211).

28129349 is an equidigital number, since it uses as much as digits as its factorization.

28129349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45210.

The product of its digits is 31104, while the sum is 38.

The square root of 28129349 is about 5303.7108707018. The cubic root of 28129349 is about 304.1257739317.

The spelling of 28129349 in words is "twenty-eight million, one hundred twenty-nine thousand, three hundred forty-nine".