127889028 has 72 divisors (see below), whose sum is σ = 345847320. Its totient is φ = 39705600.

The previous prime is 127889017. The next prime is 127889033. The reversal of 127889028 is 820988721.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 46131264 + 81757764 = 6792^2 + 9042^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60778 + ... + 62846.

It is an arithmetic number, because the mean of its divisors is an integer number (4803435).

Almost surely, 2^127889028 is an apocalyptic number.

127889028 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 127889028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172923660).

127889028 is an abundant number, since it is smaller than the sum of its proper divisors (217958292).

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

127889028 is a wasteful number, since it uses less digits than its factorization.

127889028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2197 (or 2192 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 127889028 is about 11308.8031196940. The cubic root of 127889028 is about 503.8227362251.

The spelling of 127889028 in words is "one hundred twenty-seven million, eight hundred eighty-nine thousand, twenty-eight".