28597139 has 2 divisors, whose sum is σ = 28597140. Its totient is φ = 28597138.

The previous prime is 28597099. The next prime is 28597171. The reversal of 28597139 is 93179582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28597139 - 2¹⁶ = 28531603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28597139.

It is not a weakly prime, because it can be changed into another prime (28597199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14298569 + 14298570.

It is an arithmetic number, because the mean of its divisors is an integer number (14298570).

Almost surely, 2^28597139 is an apocalyptic number.

28597139 is a deficient number, since it is larger than the sum of its proper divisors (1).

28597139 is an equidigital number, since it uses as much as digits as its factorization.

28597139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 44.

The square root of 28597139 is about 5347.6292878247. The cubic root of 28597139 is about 305.8023806966.

The spelling of 28597139 in words is "twenty-eight million, five hundred ninety-seven thousand, one hundred thirty-nine".