28133330 has 8 divisors (see below), whose sum is σ = 50640012. Its totient is φ = 11253328.

The previous prime is 28133327. The next prime is 28133333. The reversal of 28133330 is 3333182.

It is an interprime number because it is at equal distance from previous prime (28133327) and next prime (28133333).

It can be written as a sum of positive squares in 2 ways, for example, as 27321529 + 811801 = 5227^2 + 901^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 28133296 and 28133305.

It is not an unprimeable number, because it can be changed into a prime (28133333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1406657 + ... + 1406676.

Almost surely, 2^28133330 is an apocalyptic number.

28133330 is a deficient number, since it is larger than the sum of its proper divisors (22506682).

28133330 is a wasteful number, since it uses less digits than its factorization.

28133330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2813340.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 28133330 is about 5304.0861606878. The cubic root of 28133330 is about 304.1401203662.

The spelling of 28133330 in words is "twenty-eight million, one hundred thirty-three thousand, three hundred thirty".