28707139 has 2 divisors, whose sum is σ = 28707140. Its totient is φ = 28707138.

The previous prime is 28707131. The next prime is 28707163. The reversal of 28707139 is 93170782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28707139 - 2³ = 28707131 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28707098 and 28707107.

It is not a weakly prime, because it can be changed into another prime (28707131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14353569 + 14353570.

It is an arithmetic number, because the mean of its divisors is an integer number (14353570).

Almost surely, 2^28707139 is an apocalyptic number.

28707139 is a deficient number, since it is larger than the sum of its proper divisors (1).

28707139 is an equidigital number, since it uses as much as digits as its factorization.

28707139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 28707139 is about 5357.9043477837. The cubic root of 28707139 is about 306.1939725911.

The spelling of 28707139 in words is "twenty-eight million, seven hundred seven thousand, one hundred thirty-nine".