28169801 has 4 divisors (see below), whose sum is σ = 30730704. Its totient is φ = 25608900.

The previous prime is 28169797. The next prime is 28169821. The reversal of 28169801 is 10896182.

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 28169801 - 2² = 28169797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28169821) 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, 1280435 + ... + 1280456.

It is an arithmetic number, because the mean of its divisors is an integer number (7682676).

Almost surely, 2^28169801 is an apocalyptic number.

It is an amenable number.

28169801 is a deficient number, since it is larger than the sum of its proper divisors (2560903).

28169801 is a wasteful number, since it uses less digits than its factorization.

28169801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2560902.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 28169801 is about 5307.5230569447. The cubic root of 28169801 is about 304.2714889193.

The spelling of 28169801 in words is "twenty-eight million, one hundred sixty-nine thousand, eight hundred one".