27970281 has 6 divisors (see below), whose sum is σ = 40401530. Its totient is φ = 18646848.

The previous prime is 27970279. The next prime is 27970291. The reversal of 27970281 is 18207972.

It can be written as a sum of positive squares in only one way, i.e., 17139600 + 10830681 = 4140^2 + 3291^2 .

It is not a de Polignac number, because 27970281 - 2¹ = 27970279 is a prime.

It is a super-2 number, since 2×27970281² = 1564673238437922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27970211) 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, 1553896 + ... + 1553913.

Almost surely, 2^27970281 is an apocalyptic number.

It is an amenable number.

27970281 is a deficient number, since it is larger than the sum of its proper divisors (12431249).

27970281 is a wasteful number, since it uses less digits than its factorization.

27970281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3107815 (or 3107812 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 27970281 is about 5288.6936950442. The cubic root of 27970281 is about 303.5514253605.

The spelling of 27970281 in words is "twenty-seven million, nine hundred seventy thousand, two hundred eighty-one".