27999013 has 4 divisors (see below), whose sum is σ = 31998880. Its totient is φ = 23999148.

The previous prime is 27998969. The next prime is 27999029. The reversal of 27999013 is 31099972.

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 27999013 - 2¹³ = 27990821 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 (27999113) 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, 1999923 + ... + 1999936.

It is an arithmetic number, because the mean of its divisors is an integer number (7999720).

Almost surely, 2^27999013 is an apocalyptic number.

It is an amenable number.

27999013 is a deficient number, since it is larger than the sum of its proper divisors (3999867).

27999013 is an equidigital number, since it uses as much as digits as its factorization.

27999013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3999866.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 27999013 is about 5291.4093585736. The cubic root of 27999013 is about 303.6553291536.

The spelling of 27999013 in words is "twenty-seven million, nine hundred ninety-nine thousand, thirteen".