28530569 has 4 divisors (see below), whose sum is σ = 28932480. Its totient is φ = 28128660.

The previous prime is 28530563. The next prime is 28530583. The reversal of 28530569 is 96503582.

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 28530569 - 2²⁴ = 11753353 is a prime.

It is a super-2 number, since 2×28530569² = 1627986734927522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28530563) 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, 200849 + ... + 200990.

It is an arithmetic number, because the mean of its divisors is an integer number (7233120).

Almost surely, 2^28530569 is an apocalyptic number.

It is an amenable number.

28530569 is a deficient number, since it is larger than the sum of its proper divisors (401911).

28530569 is an equidigital number, since it uses as much as digits as its factorization.

28530569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401910.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 28530569 is about 5341.4014078704. The cubic root of 28530569 is about 305.5649084422.

The spelling of 28530569 in words is "twenty-eight million, five hundred thirty thousand, five hundred sixty-nine".