27806213644 has 12 divisors (see below), whose sum is σ = 53084589768. Its totient is φ = 12639188000.

The previous prime is 27806213639. The next prime is 27806213647. The reversal of 27806213644 is 44631260872.

It is a self number, because there is not a number n which added to its sum of digits gives 27806213644.

It is not an unprimeable number, because it can be changed into a prime (27806213647) 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, 315979657 + ... + 315979744.

It is an arithmetic number, because the mean of its divisors is an integer number (4423715814).

Almost surely, 2^27806213644 is an apocalyptic number.

It is an amenable number.

27806213644 is a deficient number, since it is larger than the sum of its proper divisors (25278376124).

27806213644 is a wasteful number, since it uses less digits than its factorization.

27806213644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631959416 (or 631959414 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 43.

The spelling of 27806213644 in words is "twenty-seven billion, eight hundred six million, two hundred thirteen thousand, six hundred forty-four".