28131876 has 36 divisors (see below), whose sum is σ = 71538012. Its totient is φ = 9321024.

The previous prime is 28131871. The next prime is 28131881. The reversal of 28131876 is 67813182.

It is an interprime number because it is at equal distance from previous prime (28131871) and next prime (28131881).

It can be written as a sum of positive squares in 2 ways, for example, as 10692900 + 17438976 = 3270^2 + 4176^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28131876.

It is not an unprimeable number, because it can be changed into a prime (28131871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3970 + ... + 8486.

It is an arithmetic number, because the mean of its divisors is an integer number (1987167).

Almost surely, 2^28131876 is an apocalyptic number.

It is an amenable number.

28131876 is an abundant number, since it is smaller than the sum of its proper divisors (43406136).

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

28131876 is a wasteful number, since it uses less digits than its factorization.

28131876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4700 (or 4695 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 28131876 is about 5303.9490947783. The cubic root of 28131876 is about 304.1348807050.

The spelling of 28131876 in words is "twenty-eight million, one hundred thirty-one thousand, eight hundred seventy-six".