27728775437 has 16 divisors (see below), whose sum is σ = 31232753664. Its totient is φ = 24389046000.

The previous prime is 27728775421. The next prime is 27728775439. The reversal of 27728775437 is 73457782772.

It is a happy number.

It is not a de Polignac number, because 27728775437 - 2⁴ = 27728775421 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 (27728775439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2131928 + ... + 2144894.

It is an arithmetic number, because the mean of its divisors is an integer number (1952047104).

Almost surely, 2^27728775437 is an apocalyptic number.

It is an amenable number.

27728775437 is a deficient number, since it is larger than the sum of its proper divisors (3503978227).

27728775437 is a wasteful number, since it uses less digits than its factorization.

27728775437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19280.

The product of its digits is 32269440, while the sum is 59.

The spelling of 27728775437 in words is "twenty-seven billion, seven hundred twenty-eight million, seven hundred seventy-five thousand, four hundred thirty-seven".