27731656128 has 56 divisors (see below), whose sum is σ = 80043649920. Its totient is φ = 8403531520.

The previous prime is 27731656123. The next prime is 27731656133. The reversal of 27731656128 is 82165613772.

It is an interprime number because it is at equal distance from previous prime (27731656123) and next prime (27731656133).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27731656123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6563148 + ... + 6567371.

Almost surely, 2^27731656128 is an apocalyptic number.

It is an amenable number.

27731656128 is an abundant number, since it is smaller than the sum of its proper divisors (52311993792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27731656128 is a wasteful number, since it uses less digits than its factorization.

27731656128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13130545 (or 13130535 counting only the distinct ones).

The product of its digits is 846720, while the sum is 48.

The spelling of 27731656128 in words is "twenty-seven billion, seven hundred thirty-one million, six hundred fifty-six thousand, one hundred twenty-eight".