28281473 has 8 divisors (see below), whose sum is σ = 31376160. Its totient is φ = 25274080.

The previous prime is 28281457. The next prime is 28281493. The reversal of 28281473 is 37418282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28281473 - 2⁴ = 28281457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28281403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21140 + ... + 22437.

It is an arithmetic number, because the mean of its divisors is an integer number (3922020).

Almost surely, 2^28281473 is an apocalyptic number.

It is an amenable number.

28281473 is a deficient number, since it is larger than the sum of its proper divisors (3094687).

28281473 is a wasteful number, since it uses less digits than its factorization.

28281473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43647.

The product of its digits is 21504, while the sum is 35.

The square root of 28281473 is about 5318.0328129864. The cubic root of 28281473 is about 304.6730277220.

The spelling of 28281473 in words is "twenty-eight million, two hundred eighty-one thousand, four hundred seventy-three".