28370329 has 4 divisors (see below), whose sum is σ = 30552676. Its totient is φ = 26187984.

The previous prime is 28370291. The next prime is 28370347. The reversal of 28370329 is 92307382.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2968729 + 25401600 = 1723^2 + 5040^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28370329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28370294 and 28370303.

It is not an unprimeable number, because it can be changed into a prime (28370389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1091154 + ... + 1091179.

It is an arithmetic number, because the mean of its divisors is an integer number (7638169).

Almost surely, 2^28370329 is an apocalyptic number.

It is an amenable number.

28370329 is a deficient number, since it is larger than the sum of its proper divisors (2182347).

28370329 is a wasteful number, since it uses less digits than its factorization.

28370329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2182346.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 28370329 is about 5326.3804783361. The cubic root of 28370329 is about 304.9917725990.

The spelling of 28370329 in words is "twenty-eight million, three hundred seventy thousand, three hundred twenty-nine".