22280257 has 4 divisors (see below), whose sum is σ = 22585540. Its totient is φ = 21974976.

The previous prime is 22280249. The next prime is 22280263. The reversal of 22280257 is 75208222.

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 13571856 + 8708401 = 3684^2 + 2951^2 .

It is a cyclic number.

It is not a de Polignac number, because 22280257 - 2³ = 22280249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22280267) 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, 152532 + ... + 152677.

It is an arithmetic number, because the mean of its divisors is an integer number (5646385).

Almost surely, 2^22280257 is an apocalyptic number.

It is an amenable number.

22280257 is a deficient number, since it is larger than the sum of its proper divisors (305283).

22280257 is an equidigital number, since it uses as much as digits as its factorization.

22280257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305282.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 22280257 is about 4720.1967120026. The cubic root of 22280257 is about 281.3887511590.

Adding to 22280257 its reverse (75208222), we get a palindrome (97488479).

The spelling of 22280257 in words is "twenty-two million, two hundred eighty thousand, two hundred fifty-seven".