27145091808 has 72 divisors (see below), whose sum is σ = 78346057608. Its totient is φ = 8913307392.

The previous prime is 27145091797. The next prime is 27145091833. The reversal of 27145091808 is 80819054172.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 684091 + ... + 722682.

It is an arithmetic number, because the mean of its divisors is an integer number (1088139689).

Almost surely, 2^27145091808 is an apocalyptic number.

It is an amenable number.

27145091808 is an abundant number, since it is smaller than the sum of its proper divisors (51200965800).

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

27145091808 is a wasteful number, since it uses less digits than its factorization.

27145091808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406856 (or 1406845 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 27145091808 in words is "twenty-seven billion, one hundred forty-five million, ninety-one thousand, eight hundred eight".