28221341 has 4 divisors (see below), whose sum is σ = 28338684. Its totient is φ = 28104000.

The previous prime is 28221337. The next prime is 28221353. The reversal of 28221341 is 14312282.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10824100 + 17397241 = 3290^2 + 4171^2 .

It is a cyclic number.

It is not a de Polignac number, because 28221341 - 2² = 28221337 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28221311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58310 + ... + 58791.

It is an arithmetic number, because the mean of its divisors is an integer number (7084671).

Almost surely, 2^28221341 is an apocalyptic number.

It is an amenable number.

28221341 is a deficient number, since it is larger than the sum of its proper divisors (117343).

28221341 is a wasteful number, since it uses less digits than its factorization.

28221341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117342.

The product of its digits is 768, while the sum is 23.

The square root of 28221341 is about 5312.3762103225. The cubic root of 28221341 is about 304.4569428164.

The spelling of 28221341 in words is "twenty-eight million, two hundred twenty-one thousand, three hundred forty-one".