27780638 has 8 divisors (see below), whose sum is σ = 42139440. Its totient is φ = 13734160.

The previous prime is 27780631. The next prime is 27780653. The reversal of 27780638 is 83608772.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 27780595 and 27780604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27780631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77858 + ... + 78213.

It is an arithmetic number, because the mean of its divisors is an integer number (5267430).

Almost surely, 2^27780638 is an apocalyptic number.

27780638 is a deficient number, since it is larger than the sum of its proper divisors (14358802).

27780638 is a wasteful number, since it uses less digits than its factorization.

27780638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156162.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 27780638 is about 5270.7341044678. The cubic root of 27780638 is about 302.8638265193.

The spelling of 27780638 in words is "twenty-seven million, seven hundred eighty thousand, six hundred thirty-eight".