27780969 has 8 divisors (see below), whose sum is σ = 38042560. Its totient is φ = 18020016.

The previous prime is 27780911. The next prime is 27781001. The reversal of 27780969 is 96908772.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 27780969 - 2⁹ = 27780457 is a prime.

It is a super-2 number, since 2×27780969² = 1543564477157922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27780169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125029 + ... + 125250.

It is an arithmetic number, because the mean of its divisors is an integer number (4755320).

Almost surely, 2^27780969 is an apocalyptic number.

It is an amenable number.

27780969 is a deficient number, since it is larger than the sum of its proper divisors (10261591).

27780969 is a wasteful number, since it uses less digits than its factorization.

27780969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250319.

The product of its (nonzero) digits is 381024, while the sum is 48.

The square root of 27780969 is about 5270.7655041749. The cubic root of 27780969 is about 302.8650293658.

The spelling of 27780969 in words is "twenty-seven million, seven hundred eighty thousand, nine hundred sixty-nine".