27780641 has 8 divisors (see below), whose sum is σ = 33420480. Its totient is φ = 22558608.

The previous prime is 27780631. The next prime is 27780653. The reversal of 27780641 is 14608772.

It is a happy number.

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 27780641 - 2¹⁸ = 27518497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27780611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104306 + ... + 104571.

It is an arithmetic number, because the mean of its divisors is an integer number (4177560).

Almost surely, 2^27780641 is an apocalyptic number.

It is an amenable number.

27780641 is a deficient number, since it is larger than the sum of its proper divisors (5639839).

27780641 is a wasteful number, since it uses less digits than its factorization.

27780641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208903.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 27780641 is about 5270.7343890581. The cubic root of 27780641 is about 302.8638374213.

The spelling of 27780641 in words is "twenty-seven million, seven hundred eighty thousand, six hundred forty-one".