28528969 has 4 divisors (see below), whose sum is σ = 32604544. Its totient is φ = 24453396.

The previous prime is 28528967. The next prime is 28528979. The reversal of 28528969 is 96982582.

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 28528969 - 2¹ = 28528967 is a prime.

It is a super-2 number, since 2×28528969² = 1627804144405922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28528967) 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, 2037777 + ... + 2037790.

It is an arithmetic number, because the mean of its divisors is an integer number (8151136).

Almost surely, 2^28528969 is an apocalyptic number.

It is an amenable number.

28528969 is a deficient number, since it is larger than the sum of its proper divisors (4075575).

28528969 is an equidigital number, since it uses as much as digits as its factorization.

28528969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4075574.

The product of its digits is 622080, while the sum is 49.

The square root of 28528969 is about 5341.2516323424. The cubic root of 28528969 is about 305.5591962884.

The spelling of 28528969 in words is "twenty-eight million, five hundred twenty-eight thousand, nine hundred sixty-nine".