128782340 has 24 divisors (see below), whose sum is σ = 271154520. Its totient is φ = 51377408.

The previous prime is 128782337. The next prime is 128782349. The reversal of 128782340 is 43287821.

It can be written as a sum of positive squares in 4 ways, for example, as 26853124 + 101929216 = 5182^2 + 10096^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 128782340.

It is not an unprimeable number, because it can be changed into a prime (128782349) 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, 497 + ... + 16056.

It is an arithmetic number, because the mean of its divisors is an integer number (11298105).

Almost surely, 2^128782340 is an apocalyptic number.

128782340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128782340 is an abundant number, since it is smaller than the sum of its proper divisors (142372180).

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

128782340 is a wasteful number, since it uses less digits than its factorization.

128782340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16951 (or 16949 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 128782340 is about 11348.2306991002. The cubic root of 128782340 is about 504.9930920860.

The spelling of 128782340 in words is "one hundred twenty-eight million, seven hundred eighty-two thousand, three hundred forty".