28515329 has 4 divisors (see below), whose sum is σ = 28634880. Its totient is φ = 28395780.

The previous prime is 28515269. The next prime is 28515353. The reversal of 28515329 is 92351582.

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 28515329 - 2¹⁶ = 28449793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28515359) 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, 59417 + ... + 59894.

It is an arithmetic number, because the mean of its divisors is an integer number (7158720).

Almost surely, 2^28515329 is an apocalyptic number.

It is an amenable number.

28515329 is a deficient number, since it is larger than the sum of its proper divisors (119551).

28515329 is a wasteful number, since it uses less digits than its factorization.

28515329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119550.

The product of its digits is 21600, while the sum is 35.

The square root of 28515329 is about 5339.9746254079. The cubic root of 28515329 is about 305.5104915042.

The spelling of 28515329 in words is "twenty-eight million, five hundred fifteen thousand, three hundred twenty-nine".