28531044 has 18 divisors (see below), whose sum is σ = 72120230. Its totient is φ = 9510336.

The previous prime is 28530979. The next prime is 28531051. The reversal of 28531044 is 44013582.

It can be written as a sum of positive squares in only one way, i.e., 26316900 + 2214144 = 5130^2 + 1488^2 .

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

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 28530999 and 28531017.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 396229 + ... + 396300.

Almost surely, 2^28531044 is an apocalyptic number.

It is an amenable number.

28531044 is an abundant number, since it is smaller than the sum of its proper divisors (43589186).

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

28531044 is a wasteful number, since it uses less digits than its factorization.

28531044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792539 (or 792534 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 28531044 is about 5341.4458716718. The cubic root of 28531044 is about 305.5666041968.

It can be divided in two parts, 285 and 31044, that added together give a square (31329 = 177²).

The spelling of 28531044 in words is "twenty-eight million, five hundred thirty-one thousand, forty-four".