28747333 has 4 divisors (see below), whose sum is σ = 29011180. Its totient is φ = 28483488.

The previous prime is 28747331. The next prime is 28747351. The reversal of 28747333 is 33374782.

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 7935489 + 20811844 = 2817^2 + 4562^2 .

It is a cyclic number.

It is not a de Polignac number, because 28747333 - 2¹ = 28747331 is a prime.

It is a super-2 number, since 2×28747333² = 1652818309225778, 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 = 28747292 and 28747301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28747331) 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, 131760 + ... + 131977.

It is an arithmetic number, because the mean of its divisors is an integer number (7252795).

Almost surely, 2^28747333 is an apocalyptic number.

It is an amenable number.

28747333 is a deficient number, since it is larger than the sum of its proper divisors (263847).

28747333 is a wasteful number, since it uses less digits than its factorization.

28747333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263846.

The product of its digits is 84672, while the sum is 37.

The square root of 28747333 is about 5361.6539425815. The cubic root of 28747333 is about 306.3368107086.

The spelling of 28747333 in words is "twenty-eight million, seven hundred forty-seven thousand, three hundred thirty-three".