28458139 has 2 divisors, whose sum is σ = 28458140. Its totient is φ = 28458138.

The previous prime is 28458121. The next prime is 28458163. The reversal of 28458139 is 93185482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28458139 - 2⁷ = 28458011 is a prime.

It is not a weakly prime, because it can be changed into another prime (28458169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14229069 + 14229070.

It is an arithmetic number, because the mean of its divisors is an integer number (14229070).

Almost surely, 2^28458139 is an apocalyptic number.

28458139 is a deficient number, since it is larger than the sum of its proper divisors (1).

28458139 is an equidigital number, since it uses as much as digits as its factorization.

28458139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 40.

The square root of 28458139 is about 5334.6170434250. The cubic root of 28458139 is about 305.3061120903.

The spelling of 28458139 in words is "twenty-eight million, four hundred fifty-eight thousand, one hundred thirty-nine".