27999001 has 4 divisors (see below), whose sum is σ = 28155600. Its totient is φ = 27842404.

The previous prime is 27998969. The next prime is 27999029. The reversal of 27999001 is 10099972.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27999001 - 2⁵ = 27998969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27999401) 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, 78031 + ... + 78388.

It is an arithmetic number, because the mean of its divisors is an integer number (7038900).

Almost surely, 2^27999001 is an apocalyptic number.

It is an amenable number.

27999001 is a deficient number, since it is larger than the sum of its proper divisors (156599).

27999001 is a wasteful number, since it uses less digits than its factorization.

27999001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156598.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 27999001 is about 5291.4082246600. The cubic root of 27999001 is about 303.6552857727.

The spelling of 27999001 in words is "twenty-seven million, nine hundred ninety-nine thousand, one".