28860081 has 4 divisors (see below), whose sum is σ = 38480112. Its totient is φ = 19240052.

The previous prime is 28860061. The next prime is 28860089. The reversal of 28860081 is 18006882.

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 28860081 - 2⁷ = 28859953 is a prime.

It is a super-2 number, since 2×28860081² = 1665808550653122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28860089) 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, 4810011 + ... + 4810016.

It is an arithmetic number, because the mean of its divisors is an integer number (9620028).

Almost surely, 2^28860081 is an apocalyptic number.

It is an amenable number.

28860081 is a deficient number, since it is larger than the sum of its proper divisors (9620031).

28860081 is an equidigital number, since it uses as much as digits as its factorization.

28860081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9620030.

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 28860081 is about 5372.1579463005. The cubic root of 28860081 is about 306.7367760048.

The spelling of 28860081 in words is "twenty-eight million, eight hundred sixty thousand, eighty-one".