28220241 has 16 divisors (see below), whose sum is σ = 44872704. Its totient is φ = 15424464.

The previous prime is 28220191. The next prime is 28220273. The reversal of 28220241 is 14202282.

It is a happy number.

It is not a de Polignac number, because 28220241 - 2¹⁷ = 28089169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (28220041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28731 + ... + 29696.

It is an arithmetic number, because the mean of its divisors is an integer number (2804544).

Almost surely, 2^28220241 is an apocalyptic number.

28220241 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28220241 is a deficient number, since it is larger than the sum of its proper divisors (16652463).

28220241 is a wasteful number, since it uses less digits than its factorization.

28220241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58460.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 28220241 is about 5312.2726774894. The cubic root of 28220241 is about 304.4529870986.

The spelling of 28220241 in words is "twenty-eight million, two hundred twenty thousand, two hundred forty-one".