27999761 has 8 divisors (see below), whose sum is σ = 29673000. Its totient is φ = 26373760.

The previous prime is 27999709. The next prime is 27999767. The reversal of 27999761 is 16799972.

It can be written as a sum of positive squares in 4 ways, for example, as 1795600 + 26204161 = 1340^2 + 5119^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 27999761 - 2¹⁸ = 27737617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27999767) 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, 10586 + ... + 12963.

It is an arithmetic number, because the mean of its divisors is an integer number (3709125).

Almost surely, 2^27999761 is an apocalyptic number.

It is an amenable number.

27999761 is a deficient number, since it is larger than the sum of its proper divisors (1673239).

27999761 is a wasteful number, since it uses less digits than its factorization.

27999761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23619.

The product of its digits is 428652, while the sum is 50.

The square root of 27999761 is about 5291.4800387037. The cubic root of 27999761 is about 303.6580332032.

The spelling of 27999761 in words is "twenty-seven million, nine hundred ninety-nine thousand, seven hundred sixty-one".