27678718396 has 90 divisors (see below), whose sum is σ = 57523800880. Its totient is φ = 11650831920.

The previous prime is 27678718393. The next prime is 27678718409. The reversal of 27678718396 is 69381787672.

It is a super-2 number, since 2×27678718396² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27678718391) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 144914661 + ... + 144914851.

Almost surely, 2^27678718396 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27678718396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28761900440).

27678718396 is an abundant number, since it is smaller than the sum of its proper divisors (29845082484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27678718396 is an frugal number, since it uses more digits than its factorization.

27678718396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493 (or 279 counting only the distinct ones).

The product of its digits is 42674688, while the sum is 64.

The spelling of 27678718396 in words is "twenty-seven billion, six hundred seventy-eight million, seven hundred eighteen thousand, three hundred ninety-six".