27972869 has 2 divisors, whose sum is σ = 27972870. Its totient is φ = 27972868.

The previous prime is 27972863. The next prime is 27972911. The reversal of 27972869 is 96827972.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23716900 + 4255969 = 4870^2 + 2063^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27972869 is a prime.

It is a super-2 number, since 2×27972869² = 1564962800182322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27972863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13986434 + 13986435.

It is an arithmetic number, because the mean of its divisors is an integer number (13986435).

Almost surely, 2^27972869 is an apocalyptic number.

It is an amenable number.

27972869 is a deficient number, since it is larger than the sum of its proper divisors (1).

27972869 is an equidigital number, since it uses as much as digits as its factorization.

27972869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 50.

The square root of 27972869 is about 5288.9383622803. The cubic root of 27972869 is about 303.5607872836.

The spelling of 27972869 in words is "twenty-seven million, nine hundred seventy-two thousand, eight hundred sixty-nine".