28102011 has 16 divisors (see below), whose sum is σ = 43463424. Its totient is φ = 15817824.

The previous prime is 28102001. The next prime is 28102043. The reversal of 28102011 is 11020182.

It is not a de Polignac number, because 28102011 - 2⁵ = 28101979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28102001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8580 + ... + 11393.

It is an arithmetic number, because the mean of its divisors is an integer number (2716464).

Almost surely, 2^28102011 is an apocalyptic number.

28102011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28102011 is a deficient number, since it is larger than the sum of its proper divisors (15361413).

28102011 is a wasteful number, since it uses less digits than its factorization.

28102011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20050.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 28102011 is about 5301.1329921065. The cubic root of 28102011 is about 304.0272186790.

Adding to 28102011 its reverse (11020182), we get a palindrome (39122193).

The spelling of 28102011 in words is "twenty-eight million, one hundred two thousand, eleven".