28139963 has 2 divisors, whose sum is σ = 28139964. Its totient is φ = 28139962.

The previous prime is 28139957. The next prime is 28139977. The reversal of 28139963 is 36993182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28139963 - 2⁸ = 28139707 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28139963.

It is not a weakly prime, because it can be changed into another prime (28139983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14069981 + 14069982.

It is an arithmetic number, because the mean of its divisors is an integer number (14069982).

Almost surely, 2^28139963 is an apocalyptic number.

28139963 is a deficient number, since it is larger than the sum of its proper divisors (1).

28139963 is an equidigital number, since it uses as much as digits as its factorization.

28139963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 41.

The square root of 28139963 is about 5304.7113964852. The cubic root of 28139963 is about 304.1640208773.

The spelling of 28139963 in words is "twenty-eight million, one hundred thirty-nine thousand, nine hundred sixty-three".