28171044 has 96 divisors (see below), whose sum is σ = 83220480. Its totient is φ = 8157600.

The previous prime is 28171043. The next prime is 28171061. The reversal of 28171044 is 44017182.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 28170999 and 28171017.

It is not an unprimeable number, because it can be changed into a prime (28171043) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26809 + ... + 27839.

It is an arithmetic number, because the mean of its divisors is an integer number (866880).

Almost surely, 2^28171044 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 28171044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41610240).

28171044 is an abundant number, since it is smaller than the sum of its proper divisors (55049436).

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

28171044 is a wasteful number, since it uses less digits than its factorization.

28171044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078 (or 1070 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 28171044 is about 5307.6401535899. The cubic root of 28171044 is about 304.2759642071.

The spelling of 28171044 in words is "twenty-eight million, one hundred seventy-one thousand, forty-four".