27720123619 has 16 divisors (see below), whose sum is σ = 29732361120. Its totient is φ = 25750886400.

The previous prime is 27720123617. The next prime is 27720123623. The reversal of 27720123619 is 91632102772.

It is a cyclic number.

It is not a de Polignac number, because 27720123619 - 2¹ = 27720123617 is a prime.

It is a super-2 number, since 2×27720123619² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27720123617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1584319 + ... + 1601719.

It is an arithmetic number, because the mean of its divisors is an integer number (1858272570).

Almost surely, 2^27720123619 is an apocalyptic number.

27720123619 is a deficient number, since it is larger than the sum of its proper divisors (2012237501).

27720123619 is a wasteful number, since it uses less digits than its factorization.

27720123619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18630.

The product of its (nonzero) digits is 63504, while the sum is 40.

The spelling of 27720123619 in words is "twenty-seven billion, seven hundred twenty million, one hundred twenty-three thousand, six hundred nineteen".