28033031 has 4 divisors (see below), whose sum is σ = 30189432. Its totient is φ = 25876632.

The previous prime is 28033007. The next prime is 28033043. The reversal of 28033031 is 13033082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28033031 - 2⁶ = 28032967 is a prime.

It is a super-2 number, since 2×28033031² = 1571701654093922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28032994 and 28033012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28033631) 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 in 3 ways as a sum of consecutive naturals, for example, 1078181 + ... + 1078206.

It is an arithmetic number, because the mean of its divisors is an integer number (7547358).

Almost surely, 2^28033031 is an apocalyptic number.

28033031 is a deficient number, since it is larger than the sum of its proper divisors (2156401).

28033031 is a wasteful number, since it uses less digits than its factorization.

28033031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2156400.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 28033031 is about 5294.6228383144. The cubic root of 28033031 is about 303.7782568958.

The spelling of 28033031 in words is "twenty-eight million, thirty-three thousand, thirty-one".