28133332 has 6 divisors (see below), whose sum is σ = 49233338. Its totient is φ = 14066664.

The previous prime is 28133327. The next prime is 28133333. The reversal of 28133332 is 23333182.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 26071236 + 2062096 = 5106^2 + 1436^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28133297 and 28133306.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 3516663 + ... + 3516670.

Almost surely, 2^28133332 is an apocalyptic number.

It is an amenable number.

28133332 is a deficient number, since it is larger than the sum of its proper divisors (21100006).

28133332 is a wasteful number, since it uses less digits than its factorization.

28133332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7033337 (or 7033335 counting only the distinct ones).

The product of its digits is 2592, while the sum is 25.

The square root of 28133332 is about 5304.0863492217. The cubic root of 28133332 is about 304.1401275734.

The spelling of 28133332 in words is "twenty-eight million, one hundred thirty-three thousand, three hundred thirty-two".