28240669 has 6 divisors (see below), whose sum is σ = 29805630. Its totient is φ = 26753976.

The previous prime is 28240661. The next prime is 28240673. The reversal of 28240669 is 96604282.

It can be written as a sum of positive squares in only one way, i.e., 26316900 + 1923769 = 5130^2 + 1387^2 .

It is not a de Polignac number, because 28240669 - 2³ = 28240661 is a prime.

It is a super-2 number, since 2×28240669² = 1595070771135122, 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 (28240661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38754 + ... + 39475.

It is an arithmetic number, because the mean of its divisors is an integer number (4967605).

Almost surely, 2^28240669 is an apocalyptic number.

It is an amenable number.

28240669 is a deficient number, since it is larger than the sum of its proper divisors (1564961).

28240669 is an equidigital number, since it uses as much as digits as its factorization.

28240669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78267 (or 78248 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 28240669 is about 5314.1950472296. The cubic root of 28240669 is about 304.5264316112.

The spelling of 28240669 in words is "twenty-eight million, two hundred forty thousand, six hundred sixty-nine".