28107139 has 2 divisors, whose sum is σ = 28107140. Its totient is φ = 28107138.

The previous prime is 28107133. The next prime is 28107151. The reversal of 28107139 is 93170182.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28107139 is a prime.

It is a super-2 number, since 2×28107139² = 1580022525530642, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28107139.

It is not a weakly prime, because it can be changed into another prime (28107133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14053569 + 14053570.

It is an arithmetic number, because the mean of its divisors is an integer number (14053570).

Almost surely, 2^28107139 is an apocalyptic number.

28107139 is a deficient number, since it is larger than the sum of its proper divisors (1).

28107139 is an equidigital number, since it uses as much as digits as its factorization.

28107139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 28107139 is about 5301.6166402334. The cubic root of 28107139 is about 304.0457103183.

The spelling of 28107139 in words is "twenty-eight million, one hundred seven thousand, one hundred thirty-nine".