27972805 has 8 divisors (see below), whose sum is σ = 38362752. Its totient is φ = 19181328.

The previous prime is 27972781. The next prime is 27972809. The reversal of 27972805 is 50827972.

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 27972805 - 2⁵ = 27972773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27972809) 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, 399577 + ... + 399646.

It is an arithmetic number, because the mean of its divisors is an integer number (4795344).

Almost surely, 2^27972805 is an apocalyptic number.

It is an amenable number.

27972805 is a deficient number, since it is larger than the sum of its proper divisors (10389947).

27972805 is an equidigital number, since it uses as much as digits as its factorization.

27972805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799235.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 27972805 is about 5288.9323119132. The cubic root of 27972805 is about 303.5605557747.

The spelling of 27972805 in words is "twenty-seven million, nine hundred seventy-two thousand, eight hundred five".