28270139 has 4 divisors (see below), whose sum is σ = 28412400. Its totient is φ = 28127880.

The previous prime is 28270129. The next prime is 28270159. The reversal of 28270139 is 93107282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28270139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28270129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70832 + ... + 71229.

It is an arithmetic number, because the mean of its divisors is an integer number (7103100).

Almost surely, 2^28270139 is an apocalyptic number.

28270139 is a deficient number, since it is larger than the sum of its proper divisors (142261).

28270139 is a wasteful number, since it uses less digits than its factorization.

28270139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142260.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 28270139 is about 5316.9670866012. The cubic root of 28270139 is about 304.6323223281.

The spelling of 28270139 in words is "twenty-eight million, two hundred seventy thousand, one hundred thirty-nine".