28201081 has 8 divisors (see below), whose sum is σ = 29001600. Its totient is φ = 27409008.

The previous prime is 28201051. The next prime is 28201087. The reversal of 28201081 is 18010282.

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

It is a cyclic number.

It is not a de Polignac number, because 28201081 - 2⁵ = 28201049 is a prime.

It is a super-2 number, since 2×28201081² = 1590601939137122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28201087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4990 + ... + 9016.

It is an arithmetic number, because the mean of its divisors is an integer number (3625200).

Almost surely, 2^28201081 is an apocalyptic number.

It is an amenable number.

28201081 is a deficient number, since it is larger than the sum of its proper divisors (800519).

28201081 is a wasteful number, since it uses less digits than its factorization.

28201081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4223.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 28201081 is about 5310.4690000037. The cubic root of 28201081 is about 304.3840691908.

The spelling of 28201081 in words is "twenty-eight million, two hundred one thousand, eighty-one".