28003081 has 8 divisors (see below), whose sum is σ = 28424000. Its totient is φ = 27585360.

The previous prime is 28003069. The next prime is 28003099. The reversal of 28003081 is 18030082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28003081 is a prime.

It is a super-2 number, since 2×28003081² = 1568345090985122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28003021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21046 + ... + 22336.

It is an arithmetic number, because the mean of its divisors is an integer number (3553000).

Almost surely, 2^28003081 is an apocalyptic number.

It is an amenable number.

28003081 is a deficient number, since it is larger than the sum of its proper divisors (420919).

28003081 is a wasteful number, since it uses less digits than its factorization.

28003081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1599.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 28003081 is about 5291.7937412564. The cubic root of 28003081 is about 303.6700345536.

The spelling of 28003081 in words is "twenty-eight million, three thousand, eighty-one".