127998728 has 64 divisors (see below), whose sum is σ = 284497920. Its totient is φ = 53222400.

The previous prime is 127998727. The next prime is 127998737. The reversal of 127998728 is 827899721.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 127998728.

It is not an unprimeable number, because it can be changed into a prime (127998727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144848 + ... + 145728.

It is an arithmetic number, because the mean of its divisors is an integer number (4445280).

Almost surely, 2^127998728 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 127998728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142248960).

127998728 is an abundant number, since it is smaller than the sum of its proper divisors (156499192).

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

127998728 is a wasteful number, since it uses less digits than its factorization.

127998728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038 (or 1034 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 53.

The square root of 127998728 is about 11313.6522838560. The cubic root of 127998728 is about 503.9667505570.

The spelling of 127998728 in words is "one hundred twenty-seven million, nine hundred ninety-eight thousand, seven hundred twenty-eight".