27815538012 has 24 divisors (see below), whose sum is σ = 65684887296. Its totient is φ = 9160136688.

The previous prime is 27815537957. The next prime is 27815538013. The reversal of 27815538012 is 21083551872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27815538013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13962628 + ... + 13964619.

It is an arithmetic number, because the mean of its divisors is an integer number (2736870304).

Almost surely, 2^27815538012 is an apocalyptic number.

It is an amenable number.

27815538012 is an abundant number, since it is smaller than the sum of its proper divisors (37869349284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27815538012 is a wasteful number, since it uses less digits than its factorization.

27815538012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27927337 (or 27927335 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 42.

The spelling of 27815538012 in words is "twenty-seven billion, eight hundred fifteen million, five hundred thirty-eight thousand, twelve".