28620329 has 4 divisors (see below), whose sum is σ = 28631040. Its totient is φ = 28609620.

The previous prime is 28620311. The next prime is 28620343. The reversal of 28620329 is 92302682.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28620329 - 2²⁴ = 11843113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28620295 and 28620304.

It is not an unprimeable number, because it can be changed into a prime (28622329) 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, 2324 + ... + 7914.

It is an arithmetic number, because the mean of its divisors is an integer number (7157760).

Almost surely, 2^28620329 is an apocalyptic number.

It is an amenable number.

28620329 is a deficient number, since it is larger than the sum of its proper divisors (10711).

28620329 is an equidigital number, since it uses as much as digits as its factorization.

28620329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10710.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 28620329 is about 5349.7970989562. The cubic root of 28620329 is about 305.8850188138.

The spelling of 28620329 in words is "twenty-eight million, six hundred twenty thousand, three hundred twenty-nine".