28291733 has 8 divisors (see below), whose sum is σ = 29485080. Its totient is φ = 27112960.

The previous prime is 28291727. The next prime is 28291751. The reversal of 28291733 is 33719282.

It can be written as a sum of positive squares in 4 ways, for example, as 487204 + 27804529 = 698^2 + 5273^2 .

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 28291733 - 2¹⁰ = 28290709 is a prime.

It is a super-2 number, since 2×28291733² = 1600844312286578, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28291693 and 28291702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28290733) 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, 413 + ... + 7533.

It is an arithmetic number, because the mean of its divisors is an integer number (3685635).

Almost surely, 2^28291733 is an apocalyptic number.

It is an amenable number.

28291733 is a deficient number, since it is larger than the sum of its proper divisors (1193347).

28291733 is a wasteful number, since it uses less digits than its factorization.

28291733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7287.

The product of its digits is 18144, while the sum is 35.

The square root of 28291733 is about 5318.9973679257. The cubic root of 28291733 is about 304.7098665308.

The spelling of 28291733 in words is "twenty-eight million, two hundred ninety-one thousand, seven hundred thirty-three".