27999973 has 4 divisors (see below), whose sum is σ = 28010560. Its totient is φ = 27989388.

The previous prime is 27999943. The next prime is 28000019. The reversal of 27999973 is 37999972.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 27999973 - 2¹³ = 27991781 is a prime.

It is the 5292-nd Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27999943) by changing a digit.

It is a nontrivial repunit in base 5291.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2458 + ... + 7876.

It is an arithmetic number, because the mean of its divisors is an integer number (7002640).

Almost surely, 2^27999973 is an apocalyptic number.

It is an amenable number.

27999973 is a deficient number, since it is larger than the sum of its proper divisors (10587).

27999973 is an equidigital number, since it uses as much as digits as its factorization.

27999973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10586.

The product of its digits is 1928934, while the sum is 55.

The square root of 27999973 is about 5291.5000708684. The cubic root of 27999973 is about 303.6587995829.

Subtracting 27999973 from its reverse (37999972), we obtain a palindrome (9999999).

It can be divided in two parts, 27 and 999973, that added together give a 6-th power (1000000 = 10⁶).

The spelling of 27999973 in words is "twenty-seven million, nine hundred ninety-nine thousand, nine hundred seventy-three".