28271844 has 18 divisors (see below), whose sum is σ = 71465030. Its totient is φ = 9423936.

The previous prime is 28271827. The next prime is 28271879. The reversal of 28271844 is 44817282.

It can be written as a sum of positive squares in only one way, i.e., 23912100 + 4359744 = 4890^2 + 2088^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 785329 = 28271844 / (2 + 8 + 2 + 7 + 1 + 8 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 28271799 and 28271808.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 392629 + ... + 392700.

Almost surely, 2^28271844 is an apocalyptic number.

It is an amenable number.

28271844 is an abundant number, since it is smaller than the sum of its proper divisors (43193186).

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

28271844 is a wasteful number, since it uses less digits than its factorization.

28271844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785339 (or 785334 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 28271844 is about 5317.1274199515. The cubic root of 28271844 is about 304.6384464304.

The spelling of 28271844 in words is "twenty-eight million, two hundred seventy-one thousand, eight hundred forty-four".