127991808 has 204 divisors, whose sum is σ = 436204288. Its totient is φ = 35389440.

The previous prime is 127991807. The next prime is 127991821. The reversal of 127991808 is 808199721.

It is not an unprimeable number, because it can be changed into a prime (127991807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4128753 + ... + 4128783.

Almost surely, 2^127991808 is an apocalyptic number.

127991808 is a gapful number since it is divisible by the number (18) 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 127991808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218102144).

127991808 is an abundant number, since it is smaller than the sum of its proper divisors (308212480).

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

127991808 is an frugal number, since it uses more digits than its factorization.

127991808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76 (or 43 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

The square root of 127991808 is about 11313.3464545200. The cubic root of 127991808 is about 503.9576684023.

The spelling of 127991808 in words is "one hundred twenty-seven million, nine hundred ninety-one thousand, eight hundred eight".