28530208 has 48 divisors (see below), whose sum is σ = 65185344. Its totient is φ = 12038400.

The previous prime is 28530193. The next prime is 28530221. The reversal of 28530208 is 80203582.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 14058 + ... + 15958.

It is an arithmetic number, because the mean of its divisors is an integer number (1358028).

Almost surely, 2^28530208 is an apocalyptic number.

28530208 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28530208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32592672).

28530208 is an abundant number, since it is smaller than the sum of its proper divisors (36655136).

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

28530208 is a wasteful number, since it uses less digits than its factorization.

28530208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1985 (or 1977 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 28530208 is about 5341.3676151338. The cubic root of 28530208 is about 305.5636196562.

The spelling of 28530208 in words is "twenty-eight million, five hundred thirty thousand, two hundred eight".