27823781461 has 4 divisors (see below), whose sum is σ = 31798607392. Its totient is φ = 23848955532.

The previous prime is 27823781449. The next prime is 27823781471. The reversal of 27823781461 is 16418732872.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27823781461 - 2²¹ = 27821684309 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 (27823781471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1987412955 + ... + 1987412968.

It is an arithmetic number, because the mean of its divisors is an integer number (7949651848).

Almost surely, 2^27823781461 is an apocalyptic number.

It is an amenable number.

27823781461 is a deficient number, since it is larger than the sum of its proper divisors (3974825931).

27823781461 is an equidigital number, since it uses as much as digits as its factorization.

27823781461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3974825930.

The product of its digits is 903168, while the sum is 49.

The spelling of 27823781461 in words is "twenty-seven billion, eight hundred twenty-three million, seven hundred eighty-one thousand, four hundred sixty-one".