27661590638 has 8 divisors (see below), whose sum is σ = 45264421080. Its totient is φ = 12573450280.

The previous prime is 27661590631. The next prime is 27661590653. The reversal of 27661590638 is 83609516672.

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

It is a self number, because there is not a number n which added to its sum of digits gives 27661590638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27661590631) 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, 628672493 + ... + 628672536.

It is an arithmetic number, because the mean of its divisors is an integer number (5658052635).

Almost surely, 2^27661590638 is an apocalyptic number.

27661590638 is a deficient number, since it is larger than the sum of its proper divisors (17602830442).

27661590638 is a wasteful number, since it uses less digits than its factorization.

27661590638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1257345042.

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 27661590638 in words is "twenty-seven billion, six hundred sixty-one million, five hundred ninety thousand, six hundred thirty-eight".