28942733 has 4 divisors (see below), whose sum is σ = 28955868. Its totient is φ = 28929600.

The previous prime is 28942729. The next prime is 28942777. The reversal of 28942733 is 33724982.

It is a happy number.

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 18164644 + 10778089 = 4262^2 + 3283^2 .

It is a cyclic number.

It is not a de Polignac number, because 28942733 - 2² = 28942729 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28942723) 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, 2366 + ... + 7967.

It is an arithmetic number, because the mean of its divisors is an integer number (7238967).

Almost surely, 2^28942733 is an apocalyptic number.

It is an amenable number.

28942733 is a deficient number, since it is larger than the sum of its proper divisors (13135).

28942733 is a wasteful number, since it uses less digits than its factorization.

28942733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13134.

The product of its digits is 72576, while the sum is 38.

The square root of 28942733 is about 5379.8450721187. The cubic root of 28942733 is about 307.0293166980.

The spelling of 28942733 in words is "twenty-eight million, nine hundred forty-two thousand, seven hundred thirty-three".