28220141 has 4 divisors (see below), whose sum is σ = 28239552. Its totient is φ = 28200732.

The previous prime is 28220131. The next prime is 28220147. The reversal of 28220141 is 14102282.

It is a happy number.

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 28220141 - 2¹⁴ = 28203757 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 (28220147) 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, 7331 + ... + 10496.

It is an arithmetic number, because the mean of its divisors is an integer number (7059888).

Almost surely, 2^28220141 is an apocalyptic number.

It is an amenable number.

28220141 is a deficient number, since it is larger than the sum of its proper divisors (19411).

28220141 is a wasteful number, since it uses less digits than its factorization.

28220141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19410.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 28220141 is about 5312.2632653136. The cubic root of 28220141 is about 304.4526274827.

The spelling of 28220141 in words is "twenty-eight million, two hundred twenty thousand, one hundred forty-one".