28083431 has 4 divisors (see below), whose sum is σ = 28110264. Its totient is φ = 28056600.

The previous prime is 28083379. The next prime is 28083449. The reversal of 28083431 is 13438082.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28083431 is a prime.

It is a super-2 number, since 2×28083431² = 1577358193463522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28083394 and 28083403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28083491) 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, 11780 + ... + 13961.

It is an arithmetic number, because the mean of its divisors is an integer number (7027566).

Almost surely, 2^28083431 is an apocalyptic number.

28083431 is a deficient number, since it is larger than the sum of its proper divisors (26833).

28083431 is a wasteful number, since it uses less digits than its factorization.

28083431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26832.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28083431 is about 5299.3802467836. The cubic root of 28083431 is about 303.9602000931.

The spelling of 28083431 in words is "twenty-eight million, eighty-three thousand, four hundred thirty-one".