27721992654 has 12 divisors (see below), whose sum is σ = 60064317456. Its totient is φ = 9240664212.

The previous prime is 27721992653. The next prime is 27721992659. The reversal of 27721992654 is 45629912772.

27721992654 is a `hidden beast` number, since 277 + 21 + 99 + 265 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 27721992654.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27721992653) 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 5 ways as a sum of consecutive naturals, for example, 770055334 + ... + 770055369.

It is an arithmetic number, because the mean of its divisors is an integer number (5005359788).

Almost surely, 2^27721992654 is an apocalyptic number.

27721992654 is an abundant number, since it is smaller than the sum of its proper divisors (32342324802).

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

27721992654 is a wasteful number, since it uses less digits than its factorization.

27721992654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540110711 (or 1540110708 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 54.

The spelling of 27721992654 in words is "twenty-seven billion, seven hundred twenty-one million, nine hundred ninety-two thousand, six hundred fifty-four".