28139107 has 2 divisors, whose sum is σ = 28139108. Its totient is φ = 28139106.

The previous prime is 28139101. The next prime is 28139123. The reversal of 28139107 is 70193182.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28139107 is a prime.

It is equal to p_1749541 and since 28139107 and 1749541 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (28139101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14069553 + 14069554.

It is an arithmetic number, because the mean of its divisors is an integer number (14069554).

Almost surely, 2^28139107 is an apocalyptic number.

28139107 is a deficient number, since it is larger than the sum of its proper divisors (1).

28139107 is an equidigital number, since it uses as much as digits as its factorization.

28139107 is an odious number, because the sum of its binary digits is odd.

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

The square root of 28139107 is about 5304.6307128772. The cubic root of 28139107 is about 304.1609366865.

The spelling of 28139107 in words is "twenty-eight million, one hundred thirty-nine thousand, one hundred seven".