28931208 has 16 divisors (see below), whose sum is σ = 72328080. Its totient is φ = 9643728.

The previous prime is 28931207. The next prime is 28931213. The reversal of 28931208 is 80213982.

It is not an unprimeable number, because it can be changed into a prime (28931207) 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, 602710 + ... + 602757.

It is an arithmetic number, because the mean of its divisors is an integer number (4520505).

Almost surely, 2^28931208 is an apocalyptic number.

It is an amenable number.

28931208 is an abundant number, since it is smaller than the sum of its proper divisors (43396872).

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

28931208 is a wasteful number, since it uses less digits than its factorization.

28931208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205476 (or 1205472 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 28931208 is about 5378.7738379672. The cubic root of 28931208 is about 306.9885582497.

The spelling of 28931208 in words is "twenty-eight million, nine hundred thirty-one thousand, two hundred eight".