28261633 has 4 divisors (see below), whose sum is σ = 29924100. Its totient is φ = 26599168.

The previous prime is 28261627. The next prime is 28261637. The reversal of 28261633 is 33616282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9659664 + 18601969 = 3108^2 + 4313^2 .

It is a cyclic number.

It is not a de Polignac number, because 28261633 - 2⁵ = 28261601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28261595 and 28261604.

It is not an unprimeable number, because it can be changed into a prime (28261637) 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 3 ways as a sum of consecutive naturals, for example, 831208 + ... + 831241.

It is an arithmetic number, because the mean of its divisors is an integer number (7481025).

Almost surely, 2^28261633 is an apocalyptic number.

It is an amenable number.

28261633 is a deficient number, since it is larger than the sum of its proper divisors (1662467).

28261633 is a wasteful number, since it uses less digits than its factorization.

28261633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662466.

The product of its digits is 10368, while the sum is 31.

The square root of 28261633 is about 5316.1671343177. The cubic root of 28261633 is about 304.6017663828.

The spelling of 28261633 in words is "twenty-eight million, two hundred sixty-one thousand, six hundred thirty-three".