27985801 has 4 divisors (see below), whose sum is σ = 28742212. Its totient is φ = 27229392.

The previous prime is 27985759. The next prime is 27985807. The reversal of 27985801 is 10858972.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14288400 + 13697401 = 3780^2 + 3701^2 .

It is a cyclic number.

It is not a de Polignac number, because 27985801 - 2⁷ = 27985673 is a prime.

It is a super-2 number, since 2×27985801² = 1566410115223202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27985807) 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, 378150 + ... + 378223.

It is an arithmetic number, because the mean of its divisors is an integer number (7185553).

Almost surely, 2^27985801 is an apocalyptic number.

It is an amenable number.

27985801 is a deficient number, since it is larger than the sum of its proper divisors (756411).

27985801 is an equidigital number, since it uses as much as digits as its factorization.

27985801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756410.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 27985801 is about 5290.1607726042. The cubic root of 27985801 is about 303.6075593101.

The spelling of 27985801 in words is "twenty-seven million, nine hundred eighty-five thousand, eight hundred one".