28328211 has 16 divisors (see below), whose sum is σ = 42489120. Its totient is φ = 18884016.

The previous prime is 28328207. The next prime is 28328213. The reversal of 28328211 is 11282382.

It is not a de Polignac number, because 28328211 - 2² = 28328207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28328213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4290 + ... + 8663.

It is an arithmetic number, because the mean of its divisors is an integer number (2655570).

Almost surely, 2^28328211 is an apocalyptic number.

28328211 is a deficient number, since it is larger than the sum of its proper divisors (14160909).

28328211 is an frugal number, since it uses more digits than its factorization.

28328211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12974 (or 12956 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 28328211 is about 5322.4252930408. The cubic root of 28328211 is about 304.8407697030.

The spelling of 28328211 in words is "twenty-eight million, three hundred twenty-eight thousand, two hundred eleven".