27878869 has 2 divisors, whose sum is σ = 27878870. Its totient is φ = 27878868.

The previous prime is 27878843. The next prime is 27878897. The reversal of 27878869 is 96887872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27436644 + 442225 = 5238^2 + 665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27878869 is a prime.

It is a super-2 number, since 2×27878869² = 1554462673438322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27878819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13939434 + 13939435.

It is an arithmetic number, because the mean of its divisors is an integer number (13939435).

Almost surely, 2^27878869 is an apocalyptic number.

It is an amenable number.

27878869 is a deficient number, since it is larger than the sum of its proper divisors (1).

27878869 is an equidigital number, since it uses as much as digits as its factorization.

27878869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2709504, while the sum is 55.

The square root of 27878869 is about 5280.0444126920. The cubic root of 27878869 is about 303.2203772422.

The spelling of 27878869 in words is "twenty-seven million, eight hundred seventy-eight thousand, eight hundred sixty-nine".