27971478 has 12 divisors (see below), whose sum is σ = 60604908. Its totient is φ = 9323820.

The previous prime is 27971467. The next prime is 27971479. The reversal of 27971478 is 87417972.

It is a happy number.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 776968 + ... + 777003.

It is an arithmetic number, because the mean of its divisors is an integer number (5050409).

Almost surely, 2^27971478 is an apocalyptic number.

27971478 is an abundant number, since it is smaller than the sum of its proper divisors (32633430).

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

27971478 is a wasteful number, since it uses less digits than its factorization.

27971478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1553979 (or 1553976 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 27971478 is about 5288.8068597747. The cubic root of 27971478 is about 303.5557555026. Note that the first 3 decimals are identical.

The spelling of 27971478 in words is "twenty-seven million, nine hundred seventy-one thousand, four hundred seventy-eight".