28251808 has 48 divisors (see below), whose sum is σ = 60529896. Its totient is φ = 12902400.

The previous prime is 28251799. The next prime is 28251827. The reversal of 28251808 is 80815282.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15776784 + 12475024 = 3972^2 + 3532^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46708 + ... + 47308.

Almost surely, 2^28251808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28251808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30264948).

28251808 is an abundant number, since it is smaller than the sum of its proper divisors (32278088).

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

28251808 is a wasteful number, since it uses less digits than its factorization.

28251808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737 (or 729 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 28251808 is about 5315.2429859791. The cubic root of 28251808 is about 304.5664645867.

It can be divided in two parts, 2825 and 1808, that multiplied together give a square (5107600 = 2260²).

The spelling of 28251808 in words is "twenty-eight million, two hundred fifty-one thousand, eight hundred eight".