28284401 has 4 divisors (see below), whose sum is σ = 28295652. Its totient is φ = 28273152.

The previous prime is 28284397. The next prime is 28284439. The reversal of 28284401 is 10448282.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 6754801 + 21529600 = 2599^2 + 4640^2 .

It is a cyclic number.

It is not a de Polignac number, because 28284401 - 2² = 28284397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28284101) 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, 65 + ... + 7521.

It is an arithmetic number, because the mean of its divisors is an integer number (7073913).

Almost surely, 2^28284401 is an apocalyptic number.

It is an amenable number.

28284401 is a deficient number, since it is larger than the sum of its proper divisors (11251).

28284401 is an equidigital number, since it uses as much as digits as its factorization.

28284401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11250.

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 28284401 is about 5318.3080956259. The cubic root of 28284401 is about 304.6835416939.

The spelling of 28284401 in words is "twenty-eight million, two hundred eighty-four thousand, four hundred one".