28431129 has 8 divisors (see below), whose sum is σ = 37994400. Its totient is φ = 18910976.

The previous prime is 28431113. The next prime is 28431167. The reversal of 28431129 is 92113482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28431129 - 2⁴ = 28431113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28431096 and 28431105.

It is not an unprimeable number, because it can be changed into a prime (28431229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9207 + ... + 11900.

It is an arithmetic number, because the mean of its divisors is an integer number (4749300).

Almost surely, 2^28431129 is an apocalyptic number.

It is an amenable number.

28431129 is a deficient number, since it is larger than the sum of its proper divisors (9563271).

28431129 is a wasteful number, since it uses less digits than its factorization.

28431129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21559.

The product of its digits is 3456, while the sum is 30.

The square root of 28431129 is about 5332.0848642909. The cubic root of 28431129 is about 305.2094914790.

It can be divided in two parts, 284 and 31129, that added together give a palindrome (31413).

The spelling of 28431129 in words is "twenty-eight million, four hundred thirty-one thousand, one hundred twenty-nine".