27996865920 has 448 divisors, whose sum is σ = 104752245600. Its totient is φ = 7138492416.

The previous prime is 27996865889. The next prime is 27996865931. The reversal of 27996865920 is 2956869972.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 10729576 + ... + 10732184.

Almost surely, 2^27996865920 is an apocalyptic number.

27996865920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27996865920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52376122800).

27996865920 is an abundant number, since it is smaller than the sum of its proper divisors (76755379680).

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

27996865920 is an equidigital number, since it uses as much as digits as its factorization.

27996865920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2669 (or 2642 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 63.

The spelling of 27996865920 in words is "twenty-seven billion, nine hundred ninety-six million, eight hundred sixty-five thousand, nine hundred twenty".