27800001 has 12 divisors (see below), whose sum is σ = 40207440. Its totient is φ = 18509400.

The previous prime is 27799999. The next prime is 27800051. The reversal of 27800001 is 10000872.

It is not a de Polignac number, because 27800001 - 2¹ = 27799999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27800051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7990 + ... + 10928.

It is an arithmetic number, because the mean of its divisors is an integer number (3350620).

Almost surely, 2^27800001 is an apocalyptic number.

It is an amenable number.

27800001 is a deficient number, since it is larger than the sum of its proper divisors (12407439).

27800001 is a wasteful number, since it uses less digits than its factorization.

27800001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3996 (or 3993 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 27800001 is about 5272.5706254160. The cubic root of 27800001 is about 302.9341751596.

Adding to 27800001 its reverse (10000872), we get a palindrome (37800873).

The spelling of 27800001 in words is "twenty-seven million, eight hundred thousand, one".