28293139 has 12 divisors (see below), whose sum is σ = 33333600. Its totient is φ = 23941008.

The previous prime is 28293113. The next prime is 28293193. The reversal of 28293139 is 93139282.

It is not a de Polignac number, because 28293139 - 2¹⁷ = 28162067 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28293098 and 28293107.

It is not an unprimeable number, because it can be changed into a prime (28293439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 217 + ... + 7525.

It is an arithmetic number, because the mean of its divisors is an integer number (2777800).

Almost surely, 2^28293139 is an apocalyptic number.

28293139 is a deficient number, since it is larger than the sum of its proper divisors (5040461).

28293139 is an equidigital number, since it uses as much as digits as its factorization.

28293139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7402 (or 7395 counting only the distinct ones).

The product of its digits is 23328, while the sum is 37.

The square root of 28293139 is about 5319.1295340497. The cubic root of 28293139 is about 304.7149141181.

The spelling of 28293139 in words is "twenty-eight million, two hundred ninety-three thousand, one hundred thirty-nine".