28173481 has 6 divisors (see below), whose sum is σ = 32773290. Its totient is φ = 24148656.

The previous prime is 28173479. The next prime is 28173491. The reversal of 28173481 is 18437182.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16883881 + 11289600 = 4109^2 + 3360^2 .

It is not a de Polignac number, because 28173481 - 2¹ = 28173479 is a prime.

It is a super-2 number, since 2×28173481² = 1587490063314722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28173461) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 287436 + ... + 287533.

It is an arithmetic number, because the mean of its divisors is an integer number (5462215).

Almost surely, 2^28173481 is an apocalyptic number.

28173481 is the 3065-th hex number.

It is an amenable number.

28173481 is a deficient number, since it is larger than the sum of its proper divisors (4599809).

28173481 is an equidigital number, since it uses as much as digits as its factorization.

28173481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574983 (or 574976 counting only the distinct ones).

The product of its digits is 10752, while the sum is 34.

The square root of 28173481 is about 5307.8697233448. The cubic root of 28173481 is about 304.2847379814.

The spelling of 28173481 in words is "twenty-eight million, one hundred seventy-three thousand, four hundred eighty-one".