128737280 has 112 divisors (see below), whose sum is σ = 353872800. Its totient is φ = 44040192.

The previous prime is 128737223. The next prime is 128737283. The reversal of 128737280 is 82737821.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128737283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286496 + ... + 286944.

Almost surely, 2^128737280 is an apocalyptic number.

128737280 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 128737280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176936400).

128737280 is an abundant number, since it is smaller than the sum of its proper divisors (225135520).

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

128737280 is an frugal number, since it uses more digits than its factorization.

128737280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487 (or 463 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 128737280 is about 11346.2451938956. The cubic root of 128737280 is about 504.9341874174.

The spelling of 128737280 in words is "one hundred twenty-eight million, seven hundred thirty-seven thousand, two hundred eighty".