27857781023 has 4 divisors (see below), whose sum is σ = 28250144208. Its totient is φ = 27465417840.

The previous prime is 27857781011. The next prime is 27857781067. The reversal of 27857781023 is 32018775872.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27857781023 - 2¹² = 27857776927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27857786023) 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 3 ways as a sum of consecutive naturals, for example, 196181486 + ... + 196181627.

It is an arithmetic number, because the mean of its divisors is an integer number (7062536052).

Almost surely, 2^27857781023 is an apocalyptic number.

27857781023 is a deficient number, since it is larger than the sum of its proper divisors (392363185).

27857781023 is an equidigital number, since it uses as much as digits as its factorization.

27857781023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392363184.

The product of its (nonzero) digits is 1317120, while the sum is 50.

The spelling of 27857781023 in words is "twenty-seven billion, eight hundred fifty-seven million, seven hundred eighty-one thousand, twenty-three".