28295139 has 4 divisors (see below), whose sum is σ = 37726856. Its totient is φ = 18863424.

The previous prime is 28295119. The next prime is 28295153. The reversal of 28295139 is 93159282.

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

It is not a de Polignac number, because 28295139 - 2⁵ = 28295107 is a prime.

It is a super-2 number, since 2×28295139² = 1601229782058642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28295097 and 28295106.

It is not an unprimeable number, because it can be changed into a prime (28295119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4715854 + ... + 4715859.

It is an arithmetic number, because the mean of its divisors is an integer number (9431714).

Almost surely, 2^28295139 is an apocalyptic number.

28295139 is a deficient number, since it is larger than the sum of its proper divisors (9431717).

28295139 is an equidigital number, since it uses as much as digits as its factorization.

28295139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9431716.

The product of its digits is 38880, while the sum is 39.

The square root of 28295139 is about 5319.3175314132. The cubic root of 28295139 is about 304.7220938972.

The spelling of 28295139 in words is "twenty-eight million, two hundred ninety-five thousand, one hundred thirty-nine".