28281081 has 8 divisors (see below), whose sum is σ = 39926304. Its totient is φ = 17744960.

The previous prime is 28281049. The next prime is 28281091. The reversal of 28281081 is 18018282.

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 28281081 - 2⁵ = 28281049 is a prime.

It is a super-2 number, since 2×28281081² = 1599639085057122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28281041) 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, 277215 + ... + 277316.

It is an arithmetic number, because the mean of its divisors is an integer number (4990788).

Almost surely, 2^28281081 is an apocalyptic number.

It is an amenable number.

28281081 is a deficient number, since it is larger than the sum of its proper divisors (11645223).

28281081 is a wasteful number, since it uses less digits than its factorization.

28281081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554551.

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 28281081 is about 5317.9959571252. The cubic root of 28281081 is about 304.6716200586.

The spelling of 28281081 in words is "twenty-eight million, two hundred eighty-one thousand, eighty-one".