128847780 has 192 divisors, whose sum is σ = 425779200. Its totient is φ = 32296320.

The previous prime is 128847779. The next prime is 128847781. The reversal of 128847780 is 87748821.

It is an interprime number because it is at equal distance from previous prime (128847779) and next prime (128847781).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (128847781) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 719731 + ... + 719909.

It is an arithmetic number, because the mean of its divisors is an integer number (2217600).

Almost surely, 2^128847780 is an apocalyptic number.

128847780 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 128847780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212889600).

128847780 is an abundant number, since it is smaller than the sum of its proper divisors (296931420).

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

128847780 is a wasteful number, since it uses less digits than its factorization.

128847780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271 (or 263 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 45.

The square root of 128847780 is about 11351.1136017573. The cubic root of 128847780 is about 505.0786140399.

The spelling of 128847780 in words is "one hundred twenty-eight million, eight hundred forty-seven thousand, seven hundred eighty".