27638321990 has 8 divisors (see below), whose sum is σ = 49748979600. Its totient is φ = 11055328792.

The previous prime is 27638321989. The next prime is 27638321993. The reversal of 27638321990 is 9912383672.

It is a happy number.

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

It is a super-3 number, since 3×27638321990³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27638321993) 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, 1381916090 + ... + 1381916109.

It is an arithmetic number, because the mean of its divisors is an integer number (6218622450).

Almost surely, 2^27638321990 is an apocalyptic number.

27638321990 is a deficient number, since it is larger than the sum of its proper divisors (22110657610).

27638321990 is a wasteful number, since it uses less digits than its factorization.

27638321990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2763832206.

The product of its (nonzero) digits is 979776, while the sum is 50.

The spelling of 27638321990 in words is "twenty-seven billion, six hundred thirty-eight million, three hundred twenty-one thousand, nine hundred ninety".