28165896 has 144 divisors (see below), whose sum is σ = 86830380. Its totient is φ = 8236800.

The previous prime is 28165883. The next prime is 28165897. The reversal of 28165896 is 69856182.

It can be written as a sum of positive squares in 2 ways, for example, as 27185796 + 980100 = 5214^2 + 990^2 .

It is not an unprimeable number, because it can be changed into a prime (28165897) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 461706 + ... + 461766.

Almost surely, 2^28165896 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 28165896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43415190).

28165896 is an abundant number, since it is smaller than the sum of its proper divisors (58664484).

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

28165896 is a wasteful number, since it uses less digits than its factorization.

28165896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148 (or 130 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 28165896 is about 5307.1551701453. The cubic root of 28165896 is about 304.2574285304.

The spelling of 28165896 in words is "twenty-eight million, one hundred sixty-five thousand, eight hundred ninety-six".