28572081 has 8 divisors (see below), whose sum is σ = 38982240. Its totient is φ = 18604992.

The previous prime is 28572077. The next prime is 28572109. The reversal of 28572081 is 18027582.

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

It is not a de Polignac number, because 28572081 - 2² = 28572077 is a prime.

It is a super-2 number, since 2×28572081² = 1632727625341122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28572001) 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, 110616 + ... + 110873.

It is an arithmetic number, because the mean of its divisors is an integer number (4872780).

Almost surely, 2^28572081 is an apocalyptic number.

It is an amenable number.

28572081 is a deficient number, since it is larger than the sum of its proper divisors (10410159).

28572081 is a wasteful number, since it uses less digits than its factorization.

28572081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221535.

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 28572081 is about 5345.2858670047. The cubic root of 28572081 is about 305.7130356832.

The spelling of 28572081 in words is "twenty-eight million, five hundred seventy-two thousand, eighty-one".