27897464871 has 24 divisors (see below), whose sum is σ = 40380115776. Its totient is φ = 18559696320.

The previous prime is 27897464849. The next prime is 27897464923. The reversal of 27897464871 is 17846479872.

27897464871 is a `hidden beast` number, since 2 + 7 + 8 + 97 + 464 + 87 + 1 = 666.

It is not a de Polignac number, because 27897464871 - 2⁵ = 27897464839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27897464799 and 27897464808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27897464821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16096921 + ... + 16098653.

It is an arithmetic number, because the mean of its divisors is an integer number (1682504824).

Almost surely, 2^27897464871 is an apocalyptic number.

27897464871 is a deficient number, since it is larger than the sum of its proper divisors (12482650905).

27897464871 is a wasteful number, since it uses less digits than its factorization.

27897464871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4423 (or 4420 counting only the distinct ones).

The product of its digits is 37933056, while the sum is 63.

The spelling of 27897464871 in words is "twenty-seven billion, eight hundred ninety-seven million, four hundred sixty-four thousand, eight hundred seventy-one".