28211208 has 16 divisors (see below), whose sum is σ = 70528080. Its totient is φ = 9403728.

The previous prime is 28211207. The next prime is 28211231. The reversal of 28211208 is 80211282.

It is a super-3 number, since 3×28211208³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 1175467 = 28211208 / (2 + 8 + 2 + 1 + 1 + 2 + 0 + 8).

It is not an unprimeable number, because it can be changed into a prime (28211201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 587710 + ... + 587757.

It is an arithmetic number, because the mean of its divisors is an integer number (4408005).

Almost surely, 2^28211208 is an apocalyptic number.

It is an amenable number.

28211208 is an abundant number, since it is smaller than the sum of its proper divisors (42316872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28211208 is a wasteful number, since it uses less digits than its factorization.

28211208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175476 (or 1175472 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 28211208 is about 5311.4224083573. The cubic root of 28211208 is about 304.4204995740.

The spelling of 28211208 in words is "twenty-eight million, two hundred eleven thousand, two hundred eight".