27920723 has 4 divisors (see below), whose sum is σ = 28098720. Its totient is φ = 27742728.

The previous prime is 27920719. The next prime is 27920779. The reversal of 27920723 is 32702972.

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

It is a cyclic number.

It is not a de Polignac number, because 27920723 - 2² = 27920719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27920723.

It is not an unprimeable number, because it can be changed into a prime (27929723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88763 + ... + 89076.

It is an arithmetic number, because the mean of its divisors is an integer number (7024680).

Almost surely, 2^27920723 is an apocalyptic number.

27920723 is a deficient number, since it is larger than the sum of its proper divisors (177997).

27920723 is a wasteful number, since it uses less digits than its factorization.

27920723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177996.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 27920723 is about 5284.0063398902. The cubic root of 27920723 is about 303.3720409754.

The spelling of 27920723 in words is "twenty-seven million, nine hundred twenty thousand, seven hundred twenty-three".