28102013 has 4 divisors (see below), whose sum is σ = 28497888. Its totient is φ = 27706140.

The previous prime is 28102001. The next prime is 28102043. The reversal of 28102013 is 31020182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28102013 - 2⁶ = 28101949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28101982 and 28102000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28102043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197831 + ... + 197972.

It is an arithmetic number, because the mean of its divisors is an integer number (7124472).

Almost surely, 2^28102013 is an apocalyptic number.

It is an amenable number.

28102013 is a deficient number, since it is larger than the sum of its proper divisors (395875).

28102013 is an equidigital number, since it uses as much as digits as its factorization.

28102013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395874.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 28102013 is about 5301.1331807454. The cubic root of 28102013 is about 304.0272258915.

Adding to 28102013 its reverse (31020182), we get a palindrome (59122195).

The spelling of 28102013 in words is "twenty-eight million, one hundred two thousand, thirteen".