28447481 has 16 divisors (see below), whose sum is σ = 30820608. Its totient is φ = 26188800.

The previous prime is 28447451. The next prime is 28447483. The reversal of 28447481 is 18474482.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28447481 is a prime.

It is a super-2 number, since 2×28447481² = 1618518350490722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28447483) 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 15 ways as a sum of consecutive naturals, for example, 91316 + ... + 91626.

It is an arithmetic number, because the mean of its divisors is an integer number (1926288).

Almost surely, 2^28447481 is an apocalyptic number.

It is an amenable number.

28447481 is a deficient number, since it is larger than the sum of its proper divisors (2373127).

28447481 is a wasteful number, since it uses less digits than its factorization.

28447481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472.

The product of its digits is 57344, while the sum is 38.

The square root of 28447481 is about 5333.6180028195. The cubic root of 28447481 is about 305.2679934248.

The spelling of 28447481 in words is "twenty-eight million, four hundred forty-seven thousand, four hundred eighty-one".