28073881 has 4 divisors (see below), whose sum is σ = 30626064. Its totient is φ = 25521700.

The previous prime is 28073873. The next prime is 28073917. The reversal of 28073881 is 18837082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28073881 - 2³ = 28073873 is a prime.

It is a super-2 number, since 2×28073881² = 1576285588804322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28073881.

It is not an unprimeable number, because it can be changed into a prime (28073831) 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, 1276075 + ... + 1276096.

It is an arithmetic number, because the mean of its divisors is an integer number (7656516).

Almost surely, 2^28073881 is an apocalyptic number.

It is an amenable number.

28073881 is a deficient number, since it is larger than the sum of its proper divisors (2552183).

28073881 is a wasteful number, since it uses less digits than its factorization.

28073881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2552182.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 28073881 is about 5298.4791214083. The cubic root of 28073881 is about 303.9257414710.

The spelling of 28073881 in words is "twenty-eight million, seventy-three thousand, eight hundred eighty-one".