28328159 has 4 divisors (see below), whose sum is σ = 28394016. Its totient is φ = 28262304.

The previous prime is 28328123. The next prime is 28328173. The reversal of 28328159 is 95182382.

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 28328159 - 2²⁰ = 27279583 is a prime.

It is a super-3 number, since 3×28328159³ (a number of 23 digits) contains 333 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 (28328459) 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, 32279 + ... + 33144.

It is an arithmetic number, because the mean of its divisors is an integer number (7098504).

Almost surely, 2^28328159 is an apocalyptic number.

28328159 is a deficient number, since it is larger than the sum of its proper divisors (65857).

28328159 is an equidigital number, since it uses as much as digits as its factorization.

28328159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65856.

The product of its digits is 34560, while the sum is 38.

The square root of 28328159 is about 5322.4204080475. The cubic root of 28328159 is about 304.8405831783.

The spelling of 28328159 in words is "twenty-eight million, three hundred twenty-eight thousand, one hundred fifty-nine".