27897464872 has 32 divisors (see below), whose sum is σ = 52514584200. Its totient is φ = 13893677824.

The previous prime is 27897464849. The next prime is 27897464923. The reversal of 27897464872 is 27846479872.

It can be written as a sum of positive squares in 4 ways, for example, as 19478668356 + 8418796516 = 139566^2 + 91754^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2399778 + ... + 2411374.

Almost surely, 2^27897464872 is an apocalyptic number.

It is an amenable number.

27897464872 is a deficient number, since it is larger than the sum of its proper divisors (24617119328).

27897464872 is a wasteful number, since it uses less digits than its factorization.

27897464872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12765 (or 12761 counting only the distinct ones).

The product of its digits is 75866112, while the sum is 64.

The spelling of 27897464872 in words is "twenty-seven billion, eight hundred ninety-seven million, four hundred sixty-four thousand, eight hundred seventy-two".