27780065 has 8 divisors (see below), whose sum is σ = 33429120. Its totient is φ = 22162032.

The previous prime is 27780047. The next prime is 27780073. The reversal of 27780065 is 56008772.

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

It is a cyclic number.

It is not a de Polignac number, because 27780065 - 2¹⁸ = 27517921 is a prime.

It is a super-2 number, since 2×27780065² = 1543464022808450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5735 + ... + 9404.

It is an arithmetic number, because the mean of its divisors is an integer number (4178640).

Almost surely, 2^27780065 is an apocalyptic number.

It is an amenable number.

27780065 is a deficient number, since it is larger than the sum of its proper divisors (5649055).

27780065 is a wasteful number, since it uses less digits than its factorization.

27780065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15511.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 27780065 is about 5270.6797474330. The cubic root of 27780065 is about 302.8617442278.

The spelling of 27780065 in words is "twenty-seven million, seven hundred eighty thousand, sixty-five".