28251108 has 18 divisors (see below), whose sum is σ = 71412614. Its totient is φ = 9417024.

The previous prime is 28251101. The next prime is 28251109. The reversal of 28251108 is 80115282.

It can be written as a sum of positive squares in only one way, i.e., 27123264 + 1127844 = 5208^2 + 1062^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (28251101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 392341 + ... + 392412.

Almost surely, 2^28251108 is an apocalyptic number.

It is an amenable number.

28251108 is an abundant number, since it is smaller than the sum of its proper divisors (43161506).

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

28251108 is a wasteful number, since it uses less digits than its factorization.

28251108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784763 (or 784758 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 28251108 is about 5315.1771372175. The cubic root of 28251108 is about 304.5639491337.

The spelling of 28251108 in words is "twenty-eight million, two hundred fifty-one thousand, one hundred eight".