28827321 has 4 divisors (see below), whose sum is σ = 38436432. Its totient is φ = 19218212.

The previous prime is 28827307. The next prime is 28827347. The reversal of 28827321 is 12372882.

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 28827321 - 2⁷ = 28827193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28827371) 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, 4804551 + ... + 4804556.

It is an arithmetic number, because the mean of its divisors is an integer number (9609108).

Almost surely, 2^28827321 is an apocalyptic number.

It is an amenable number.

28827321 is a deficient number, since it is larger than the sum of its proper divisors (9609111).

28827321 is an equidigital number, since it uses as much as digits as its factorization.

28827321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9609110.

The product of its digits is 10752, while the sum is 33.

The square root of 28827321 is about 5369.1080264789. The cubic root of 28827321 is about 306.6206698236.

The spelling of 28827321 in words is "twenty-eight million, eight hundred twenty-seven thousand, three hundred twenty-one".