28333642 has 4 divisors (see below), whose sum is σ = 42500466. Its totient is φ = 14166820.

The previous prime is 28333639. The next prime is 28333649. The reversal of 28333642 is 24633382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24633382 = 2 ⋅12316691.

It can be written as a sum of positive squares in only one way, i.e., 26020201 + 2313441 = 5101^2 + 1521^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28333649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7083409 + ... + 7083412.

Almost surely, 2^28333642 is an apocalyptic number.

28333642 is a deficient number, since it is larger than the sum of its proper divisors (14166824).

28333642 is a wasteful number, since it uses less digits than its factorization.

28333642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14166823.

The product of its digits is 20736, while the sum is 31.

The square root of 28333642 is about 5322.9354683295. The cubic root of 28333642 is about 304.8602495121.

The spelling of 28333642 in words is "twenty-eight million, three hundred thirty-three thousand, six hundred forty-two".