28127723643 has 12 divisors (see below), whose sum is σ = 43018871688. Its totient is φ = 17648767680.

The previous prime is 28127723593. The next prime is 28127723647. The reversal of 28127723643 is 34632772182.

28127723643 is a `hidden beast` number, since 281 + 2 + 7 + 7 + 2 + 364 + 3 = 666.

It is not a de Polignac number, because 28127723643 - 2⁶ = 28127723579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28127723647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91920513 + ... + 91920818.

It is an arithmetic number, because the mean of its divisors is an integer number (3584905974).

Almost surely, 2^28127723643 is an apocalyptic number.

28127723643 is a deficient number, since it is larger than the sum of its proper divisors (14891148045).

28127723643 is a wasteful number, since it uses less digits than its factorization.

28127723643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183841354 (or 183841351 counting only the distinct ones).

The product of its digits is 677376, while the sum is 45.

The spelling of 28127723643 in words is "twenty-eight billion, one hundred twenty-seven million, seven hundred twenty-three thousand, six hundred forty-three".