28102801 has 4 divisors (see below), whose sum is σ = 28365552. Its totient is φ = 27840052.

The previous prime is 28102793. The next prime is 28102807. The reversal of 28102801 is 10820182.

28102801 = 121² + 122² + ... + 441².

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 28102801 - 2³ = 28102793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28102807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131215 + ... + 131428.

It is an arithmetic number, because the mean of its divisors is an integer number (7091388).

Almost surely, 2^28102801 is an apocalyptic number.

It is an amenable number.

28102801 is a deficient number, since it is larger than the sum of its proper divisors (262751).

28102801 is a wasteful number, since it uses less digits than its factorization.

28102801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262750.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 28102801 is about 5301.2075039561. The cubic root of 28102801 is about 304.0300675766.

Adding to 28102801 its reverse (10820182), we get a palindrome (38922983).

The spelling of 28102801 in words is "twenty-eight million, one hundred two thousand, eight hundred one".