28342569 has 4 divisors (see below), whose sum is σ = 37790096. Its totient is φ = 18895044.

The previous prime is 28342529. The next prime is 28342571. The reversal of 28342569 is 96524382.

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 not a de Polignac number, because 28342569 - 2⁷ = 28342441 is a prime.

It is a super-2 number, since 2×28342569² = 1606602435039522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28342529) 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, 4723759 + ... + 4723764.

It is an arithmetic number, because the mean of its divisors is an integer number (9447524).

Almost surely, 2^28342569 is an apocalyptic number.

It is an amenable number.

28342569 is a deficient number, since it is larger than the sum of its proper divisors (9447527).

28342569 is an equidigital number, since it uses as much as digits as its factorization.

28342569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9447526.

The product of its digits is 103680, while the sum is 39.

The square root of 28342569 is about 5323.7739433601. The cubic root of 28342569 is about 304.8922633008.

The spelling of 28342569 in words is "twenty-eight million, three hundred forty-two thousand, five hundred sixty-nine".