27727828557 has 32 divisors (see below), whose sum is σ = 43855558656. Its totient is φ = 15361444800.

The previous prime is 27727828547. The next prime is 27727828571. The reversal of 27727828557 is 75582872772.

It is a happy number.

It is not a de Polignac number, because 27727828557 - 2⁸ = 27727828301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27727828557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27727828547) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 269569 + ... + 357942.

It is an arithmetic number, because the mean of its divisors is an integer number (1370486208).

Almost surely, 2^27727828557 is an apocalyptic number.

It is an amenable number.

27727828557 is a deficient number, since it is larger than the sum of its proper divisors (16127730099).

27727828557 is a wasteful number, since it uses less digits than its factorization.

27727828557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627641.

The product of its digits is 30732800, while the sum is 60.

The spelling of 27727828557 in words is "twenty-seven billion, seven hundred twenty-seven million, eight hundred twenty-eight thousand, five hundred fifty-seven".