27491373128 has 60 divisors (see below), whose sum is σ = 54152037225. Its totient is φ = 13084207200.

The previous prime is 27491373127. The next prime is 27491373131. The reversal of 27491373128 is 82137319472.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 18621877444 + 8869495684 = 136462^2 + 94178^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=117242.

It is a Duffinian number.

Its product of digits (508032) is a multiple of the sum of its prime factors (252).

It is not an unprimeable number, because it can be changed into a prime (27491373121) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 450678218 + ... + 450678278.

Almost surely, 2^27491373128 is an apocalyptic number.

It is an amenable number.

27491373128 is a deficient number, since it is larger than the sum of its proper divisors (26660664097).

27491373128 is an frugal number, since it uses more digits than its factorization.

27491373128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252 (or 94 counting only the distinct ones).

The product of its digits is 508032, while the sum is 47.

The spelling of 27491373128 in words is "twenty-seven billion, four hundred ninety-one million, three hundred seventy-three thousand, one hundred twenty-eight".