28103011 has 4 divisors (see below), whose sum is σ = 28113624. Its totient is φ = 28092400.

The previous prime is 28103003. The next prime is 28103077. The reversal of 28103011 is 11030182.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 11030182 = 2 ⋅5515091.

It is a cyclic number.

It is not a de Polignac number, because 28103011 - 2³ = 28103003 is a prime.

It is a super-2 number, since 2×28103011² = 1579558454532242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28103111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2316 + ... + 7846.

It is an arithmetic number, because the mean of its divisors is an integer number (7028406).

Almost surely, 2^28103011 is an apocalyptic number.

28103011 is a deficient number, since it is larger than the sum of its proper divisors (10613).

28103011 is an equidigital number, since it uses as much as digits as its factorization.

28103011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10612.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 28103011 is about 5301.2273107272. The cubic root of 28103011 is about 304.0308248695.

Adding to 28103011 its reverse (11030182), we get a palindrome (39133193).

The spelling of 28103011 in words is "twenty-eight million, one hundred three thousand, eleven".