28045881 has 12 divisors (see below), whose sum is σ = 42643120. Its totient is φ = 17713080.

The previous prime is 28045879. The next prime is 28045931. The reversal of 28045881 is 18854082.

It is not a de Polignac number, because 28045881 - 2¹ = 28045879 is a prime.

It is a super-2 number, since 2×28045881² = 1573142882132322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28045811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81835 + ... + 82176.

Almost surely, 2^28045881 is an apocalyptic number.

It is an amenable number.

28045881 is a deficient number, since it is larger than the sum of its proper divisors (14597239).

28045881 is a wasteful number, since it uses less digits than its factorization.

28045881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164036 (or 164033 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 28045881 is about 5295.8361945967. The cubic root of 28045881 is about 303.8246658899.

The spelling of 28045881 in words is "twenty-eight million, forty-five thousand, eight hundred eighty-one".