28171040 has 48 divisors (see below), whose sum is σ = 70475832. Its totient is φ = 10604544.

The previous prime is 28171009. The next prime is 28171043. The reversal of 28171040 is 4017182.

It can be written as a sum of positive squares in 4 ways, for example, as 25441936 + 2729104 = 5044^2 + 1652^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28170997 and 28171015.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2459 + ... + 7898.

Almost surely, 2^28171040 is an apocalyptic number.

28171040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28171040 is an abundant number, since it is smaller than the sum of its proper divisors (42304792).

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

28171040 is a wasteful number, since it uses less digits than its factorization.

28171040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10389 (or 10381 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 28171040 is about 5307.6397767746. The cubic root of 28171040 is about 304.2759498057.

The spelling of 28171040 in words is "twenty-eight million, one hundred seventy-one thousand, forty".