27971489 has 16 divisors (see below), whose sum is σ = 34997760. Its totient is φ = 21764160.

The previous prime is 27971479. The next prime is 27971497. The reversal of 27971489 is 98417972.

It is a cyclic number.

It is not a de Polignac number, because 27971489 - 2²⁰ = 26922913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27971479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3032 + ... + 8070.

It is an arithmetic number, because the mean of its divisors is an integer number (2187360).

Almost surely, 2^27971489 is an apocalyptic number.

It is an amenable number.

27971489 is a deficient number, since it is larger than the sum of its proper divisors (7026271).

27971489 is a wasteful number, since it uses less digits than its factorization.

27971489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5120.

The product of its digits is 254016, while the sum is 47.

The square root of 27971489 is about 5288.8078997067. The cubic root of 27971489 is about 303.5557952945. Note that the first 3 decimals are identical.

The spelling of 27971489 in words is "twenty-seven million, nine hundred seventy-one thousand, four hundred eighty-nine".