27780869 has 16 divisors (see below), whose sum is σ = 30566400. Its totient is φ = 25147584.

The previous prime is 27780853. The next prime is 27780871. The reversal of 27780869 is 96808772.

It is a cyclic number.

It is not a de Polignac number, because 27780869 - 2⁴ = 27780853 is a prime.

It is a super-2 number, since 2×27780869² = 1543553364790322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27780889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69779 + ... + 70175.

It is an arithmetic number, because the mean of its divisors is an integer number (1910400).

Almost surely, 2^27780869 is an apocalyptic number.

27780869 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

27780869 is a deficient number, since it is larger than the sum of its proper divisors (2785531).

27780869 is a wasteful number, since it uses less digits than its factorization.

27780869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 27780869 is about 5270.7560178783. The cubic root of 27780869 is about 302.8646659691.

The spelling of 27780869 in words is "twenty-seven million, seven hundred eighty thousand, eight hundred sixty-nine".