27012345678 has 24 divisors (see below), whose sum is σ = 59184356400. Its totient is φ = 8902944864.

The previous prime is 27012345677. The next prime is 27012345743. The reversal of 27012345678 is 87654321072.

27012345678 is a `hidden beast` number, since 2 + 7 + 0 + 123 + 456 + 78 = 666.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27012345671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8429218 + ... + 8432421.

It is an arithmetic number, because the mean of its divisors is an integer number (2466014850).

Almost surely, 2^27012345678 is an apocalyptic number.

27012345678 is an abundant number, since it is smaller than the sum of its proper divisors (32172010722).

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

27012345678 is a wasteful number, since it uses less digits than its factorization.

27012345678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16861736 (or 16861733 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 27012345678 in words is "twenty-seven billion, twelve million, three hundred forty-five thousand, six hundred seventy-eight".