28528999 has 4 divisors (see below), whose sum is σ = 29067336. Its totient is φ = 27990664.

The previous prime is 28528979. The next prime is 28529027. The reversal of 28528999 is 99982582.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28528999 - 2⁵ = 28528967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28528939) 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, 269089 + ... + 269194.

It is an arithmetic number, because the mean of its divisors is an integer number (7266834).

Almost surely, 2^28528999 is an apocalyptic number.

28528999 is a deficient number, since it is larger than the sum of its proper divisors (538337).

28528999 is an equidigital number, since it uses as much as digits as its factorization.

28528999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538336.

The product of its digits is 933120, while the sum is 52.

The square root of 28528999 is about 5341.2544406722. The cubic root of 28528999 is about 305.5593033933.

The spelling of 28528999 in words is "twenty-eight million, five hundred twenty-eight thousand, nine hundred ninety-nine".