27990042171 has 64 divisors (see below), whose sum is σ = 46281424896. Its totient is φ = 14652288000.

The previous prime is 27990042169. The next prime is 27990042209. The reversal of 27990042171 is 17124009972.

It is not a de Polignac number, because 27990042171 - 2¹ = 27990042169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27990042271) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24317446 + ... + 24318596.

It is an arithmetic number, because the mean of its divisors is an integer number (723147264).

Almost surely, 2^27990042171 is an apocalyptic number.

27990042171 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

27990042171 is a deficient number, since it is larger than the sum of its proper divisors (18291382725).

27990042171 is a wasteful number, since it uses less digits than its factorization.

27990042171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1772.

The product of its (nonzero) digits is 63504, while the sum is 42.

The spelling of 27990042171 in words is "twenty-seven billion, nine hundred ninety million, forty-two thousand, one hundred seventy-one".