28372139 has 8 divisors (see below), whose sum is σ = 29084160. Its totient is φ = 27669096.

The previous prime is 28372117. The next prime is 28372151. The reversal of 28372139 is 93127382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28372139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28372099 and 28372108.

It is not an unprimeable number, because it can be changed into a prime (28372189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4394 + ... + 8720.

It is an arithmetic number, because the mean of its divisors is an integer number (3635520).

Almost surely, 2^28372139 is an apocalyptic number.

28372139 is a deficient number, since it is larger than the sum of its proper divisors (712021).

28372139 is an equidigital number, since it uses as much as digits as its factorization.

28372139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4489.

The product of its digits is 18144, while the sum is 35.

The square root of 28372139 is about 5326.5503846298. The cubic root of 28372139 is about 304.9982585227.

The spelling of 28372139 in words is "twenty-eight million, three hundred seventy-two thousand, one hundred thirty-nine".