27726638545 has 8 divisors (see below), whose sum is σ = 34345255680. Its totient is φ = 21465784560.

The previous prime is 27726638447. The next prime is 27726638587. The reversal of 27726638545 is 54583662772.

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

It is not a de Polignac number, because 27726638545 - 2¹³ = 27726630353 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 89440615 + ... + 89440924.

It is an arithmetic number, because the mean of its divisors is an integer number (4293156960).

Almost surely, 2^27726638545 is an apocalyptic number.

It is an amenable number.

27726638545 is a deficient number, since it is larger than the sum of its proper divisors (6618617135).

27726638545 is a wasteful number, since it uses less digits than its factorization.

27726638545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178881575.

The product of its digits is 16934400, while the sum is 55.

The spelling of 27726638545 in words is "twenty-seven billion, seven hundred twenty-six million, six hundred thirty-eight thousand, five hundred forty-five".