27971620 has 12 divisors (see below), whose sum is σ = 58740444. Its totient is φ = 11188640.

The previous prime is 27971569. The next prime is 27971633. The reversal of 27971620 is 2617972.

27971620 is nontrivially palindromic in base 3.

It can be written as a sum of positive squares in 2 ways, for example, as 19642624 + 8328996 = 4432^2 + 2886^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 699271 + ... + 699310.

It is an arithmetic number, because the mean of its divisors is an integer number (4895037).

Almost surely, 2^27971620 is an apocalyptic number.

27971620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27971620 is an abundant number, since it is smaller than the sum of its proper divisors (30768824).

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

27971620 is a wasteful number, since it uses less digits than its factorization.

27971620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398590 (or 1398588 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 27971620 is about 5288.8202843356. The cubic root of 27971620 is about 303.5562691787.

The spelling of 27971620 in words is "twenty-seven million, nine hundred seventy-one thousand, six hundred twenty".