27728746373 has 4 divisors (see below), whose sum is σ = 27872418828. Its totient is φ = 27585073920.

The previous prime is 27728746303. The next prime is 27728746403. The reversal of 27728746373 is 37364782772.

It is a happy number.

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 17716142404 + 10012603969 = 133102^2 + 100063^2 .

It is a cyclic number.

It is not a de Polignac number, because 27728746373 - 2¹² = 27728742277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27728746303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71835938 + ... + 71836323.

It is an arithmetic number, because the mean of its divisors is an integer number (6968104707).

Almost surely, 2^27728746373 is an apocalyptic number.

It is an amenable number.

27728746373 is a deficient number, since it is larger than the sum of its proper divisors (143672455).

27728746373 is a wasteful number, since it uses less digits than its factorization.

27728746373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143672454.

The product of its digits is 16595712, while the sum is 56.

The spelling of 27728746373 in words is "twenty-seven billion, seven hundred twenty-eight million, seven hundred forty-six thousand, three hundred seventy-three".