28347139 has 2 divisors, whose sum is σ = 28347140. Its totient is φ = 28347138.

The previous prime is 28347133. The next prime is 28347173. The reversal of 28347139 is 93174382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28347139 - 2³ = 28347131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28347098 and 28347107.

It is not a weakly prime, because it can be changed into another prime (28347131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14173569 + 14173570.

It is an arithmetic number, because the mean of its divisors is an integer number (14173570).

Almost surely, 2^28347139 is an apocalyptic number.

28347139 is a deficient number, since it is larger than the sum of its proper divisors (1).

28347139 is an equidigital number, since it uses as much as digits as its factorization.

28347139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 28347139 is about 5324.2031328641. The cubic root of 28347139 is about 304.9086495213.

The spelling of 28347139 in words is "twenty-eight million, three hundred forty-seven thousand, one hundred thirty-nine".