27906961481 has 4 divisors (see below), whose sum is σ = 31893670272. Its totient is φ = 23920252692.

The previous prime is 27906961463. The next prime is 27906961573. The reversal of 27906961481 is 18416960972.

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 not a de Polignac number, because 27906961481 - 2³⁰ = 26833219657 is a prime.

It is a super-2 number, since 2×27906961481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27906961451) 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, 1993354385 + ... + 1993354398.

It is an arithmetic number, because the mean of its divisors is an integer number (7973417568).

Almost surely, 2^27906961481 is an apocalyptic number.

It is an amenable number.

27906961481 is a deficient number, since it is larger than the sum of its proper divisors (3986708791).

27906961481 is an equidigital number, since it uses as much as digits as its factorization.

27906961481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3986708790.

The product of its (nonzero) digits is 1306368, while the sum is 53.

The spelling of 27906961481 in words is "twenty-seven billion, nine hundred six million, nine hundred sixty-one thousand, four hundred eighty-one".