128787880 has 64 divisors (see below), whose sum is σ = 318018960. Its totient is φ = 46645248.

The previous prime is 128787877. The next prime is 128787887. The reversal of 128787880 is 88787821.

It can be written as a sum of positive squares in 8 ways, for example, as 81974916 + 46812964 = 9054^2 + 6842^2 .

It is not an unprimeable number, because it can be changed into a prime (128787887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25224 + ... + 29896.

Almost surely, 2^128787880 is an apocalyptic number.

128787880 is a gapful number since it is divisible by the number (10) 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 128787880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159009480).

128787880 is an abundant number, since it is smaller than the sum of its proper divisors (189231080).

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

128787880 is a wasteful number, since it uses less digits than its factorization.

128787880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4750 (or 4746 counting only the distinct ones).

The product of its (nonzero) digits is 401408, while the sum is 49.

The square root of 128787880 is about 11348.4747873888. The cubic root of 128787880 is about 505.0003333004. Note that the first 3 decimals are identical.

The spelling of 128787880 in words is "one hundred twenty-eight million, seven hundred eighty-seven thousand, eight hundred eighty".