28641329 has 8 divisors (see below), whose sum is σ = 29756160. Its totient is φ = 27546400.

The previous prime is 28641281. The next prime is 28641343. The reversal of 28641329 is 92314682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28641329 - 2²⁰ = 27592753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28641029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2009 + ... + 7830.

It is an arithmetic number, because the mean of its divisors is an integer number (3719520).

Almost surely, 2^28641329 is an apocalyptic number.

It is an amenable number.

28641329 is a deficient number, since it is larger than the sum of its proper divisors (1114831).

28641329 is an equidigital number, since it uses as much as digits as its factorization.

28641329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9951.

The product of its digits is 20736, while the sum is 35.

The square root of 28641329 is about 5351.7594303182. The cubic root of 28641329 is about 305.9598143079.

The spelling of 28641329 in words is "twenty-eight million, six hundred forty-one thousand, three hundred twenty-nine".