28420329 has 32 divisors (see below), whose sum is σ = 45137920. Its totient is φ = 15567552.

The previous prime is 28420309. The next prime is 28420363. The reversal of 28420329 is 92302482.

It is not a de Polignac number, because 28420329 - 2⁷ = 28420201 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28420296 and 28420305.

It is not an unprimeable number, because it can be changed into a prime (28420309) 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 31 ways as a sum of consecutive naturals, for example, 61152 + ... + 61614.

It is an arithmetic number, because the mean of its divisors is an integer number (1410560).

Almost surely, 2^28420329 is an apocalyptic number.

It is an amenable number.

28420329 is a deficient number, since it is larger than the sum of its proper divisors (16717591).

28420329 is a wasteful number, since it uses less digits than its factorization.

28420329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 28420329 is about 5331.0720310272. The cubic root of 28420329 is about 305.1708404171.

The spelling of 28420329 in words is "twenty-eight million, four hundred twenty thousand, three hundred twenty-nine".