28145208 has 128 divisors (see below), whose sum is σ = 88704000. Its totient is φ = 7394688.

The previous prime is 28145207. The next prime is 28145209. The reversal of 28145208 is 80254182.

It is an interprime number because it is at equal distance from previous prime (28145207) and next prime (28145209).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28145203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106885 + ... + 107147.

It is an arithmetic number, because the mean of its divisors is an integer number (693000).

Almost surely, 2^28145208 is an apocalyptic number.

28145208 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 28145208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44352000).

28145208 is an abundant number, since it is smaller than the sum of its proper divisors (60558792).

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

28145208 is a wasteful number, since it uses less digits than its factorization.

28145208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 28145208 is about 5305.2057453034. The cubic root of 28145208 is about 304.1829173862.

The spelling of 28145208 in words is "twenty-eight million, one hundred forty-five thousand, two hundred eight".