27771641428 has 24 divisors (see below), whose sum is σ = 49825661760. Its totient is φ = 13536281280.

The previous prime is 27771641399. The next prime is 27771641459. The reversal of 27771641428 is 82414617772.

It is a congruent number.

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, 139225 + ... + 273727.

It is an arithmetic number, because the mean of its divisors is an integer number (2076069240).

Almost surely, 2^27771641428 is an apocalyptic number.

It is an amenable number.

27771641428 is a deficient number, since it is larger than the sum of its proper divisors (22054020332).

27771641428 is a wasteful number, since it uses less digits than its factorization.

27771641428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135807 (or 135805 counting only the distinct ones).

The product of its digits is 1053696, while the sum is 49.

The spelling of 27771641428 in words is "twenty-seven billion, seven hundred seventy-one million, six hundred forty-one thousand, four hundred twenty-eight".