28245181 has 4 divisors (see below), whose sum is σ = 28467712. Its totient is φ = 28022652.

The previous prime is 28245179. The next prime is 28245199. The reversal of 28245181 is 18154282.

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 28245181 - 2¹ = 28245179 is a prime.

It is a super-2 number, since 2×28245181² = 1595580499445522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28243181) 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, 111075 + ... + 111328.

It is an arithmetic number, because the mean of its divisors is an integer number (7116928).

Almost surely, 2^28245181 is an apocalyptic number.

It is an amenable number.

28245181 is a deficient number, since it is larger than the sum of its proper divisors (222531).

28245181 is a wasteful number, since it uses less digits than its factorization.

28245181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222530.

The product of its digits is 5120, while the sum is 31.

The square root of 28245181 is about 5314.6195536463. The cubic root of 28245181 is about 304.5426487682.

The spelling of 28245181 in words is "twenty-eight million, two hundred forty-five thousand, one hundred eighty-one".