27720733 has 4 divisors (see below), whose sum is σ = 28469980. Its totient is φ = 26971488.

The previous prime is 27720703. The next prime is 27720739. The reversal of 27720733 is 33702772.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22867524 + 4853209 = 4782^2 + 2203^2 .

It is a cyclic number.

It is not a de Polignac number, because 27720733 - 2⁵ = 27720701 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27720695 and 27720704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27720739) 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, 374568 + ... + 374641.

It is an arithmetic number, because the mean of its divisors is an integer number (7117495).

Almost surely, 2^27720733 is an apocalyptic number.

It is an amenable number.

27720733 is a deficient number, since it is larger than the sum of its proper divisors (749247).

27720733 is an equidigital number, since it uses as much as digits as its factorization.

27720733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749246.

The product of its (nonzero) digits is 12348, while the sum is 31.

The square root of 27720733 is about 5265.0482428939. The cubic root of 27720733 is about 302.6459755812.

The spelling of 27720733 in words is "twenty-seven million, seven hundred twenty thousand, seven hundred thirty-three".