28435139 has 4 divisors (see below), whose sum is σ = 28466424. Its totient is φ = 28403856.

The previous prime is 28435133. The next prime is 28435171. The reversal of 28435139 is 93153482.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28435139 - 2⁴ = 28435123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28435099 and 28435108.

It is not an unprimeable number, because it can be changed into a prime (28435133) 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 3 ways as a sum of consecutive naturals, for example, 14237 + ... + 16110.

It is an arithmetic number, because the mean of its divisors is an integer number (7116606).

Almost surely, 2^28435139 is an apocalyptic number.

28435139 is a deficient number, since it is larger than the sum of its proper divisors (31285).

28435139 is an equidigital number, since it uses as much as digits as its factorization.

28435139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31284.

The product of its digits is 25920, while the sum is 35.

The square root of 28435139 is about 5332.4608765560. The cubic root of 28435139 is about 305.2238399832.

The spelling of 28435139 in words is "twenty-eight million, four hundred thirty-five thousand, one hundred thirty-nine".