27643821398 has 16 divisors (see below), whose sum is σ = 41550655536. Its totient is φ = 13793633280.

The previous prime is 27643821389. The next prime is 27643821479. The reversal of 27643821398 is 89312834672.

It is a super-2 number, since 2×27643821398² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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, 2100278 + ... + 2113398.

It is an arithmetic number, because the mean of its divisors is an integer number (2596915971).

Almost surely, 2^27643821398 is an apocalyptic number.

27643821398 is a deficient number, since it is larger than the sum of its proper divisors (13906834138).

27643821398 is a wasteful number, since it uses less digits than its factorization.

27643821398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15199.

The product of its digits is 3483648, while the sum is 53.

The spelling of 27643821398 in words is "twenty-seven billion, six hundred forty-three million, eight hundred twenty-one thousand, three hundred ninety-eight".