28285283281 has 8 divisors (see below), whose sum is σ = 29971153224. Its totient is φ = 26601861120.

The previous prime is 28285283249. The next prime is 28285283317. The reversal of 28285283281 is 18238258282.

It can be written as a sum of positive squares in 4 ways, for example, as 1813993281 + 26471290000 = 42591^2 + 162700^2 .

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

It is not a de Polignac number, because 28285283281 - 2⁵ = 28285283249 is a prime.

It is a super-2 number, since 2×28285283281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28285283981) 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, 588120 + ... + 634393.

It is an arithmetic number, because the mean of its divisors is an integer number (3746394153).

Almost surely, 2^28285283281 is an apocalyptic number.

It is an amenable number.

28285283281 is a deficient number, since it is larger than the sum of its proper divisors (1685869943).

28285283281 is a wasteful number, since it uses less digits than its factorization.

28285283281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223891.

The product of its digits is 983040, while the sum is 49.

The spelling of 28285283281 in words is "twenty-eight billion, two hundred eighty-five million, two hundred eighty-three thousand, two hundred eighty-one".