128699340 has 192 divisors, whose sum is σ = 455777280. Its totient is φ = 26357760.

The previous prime is 128699327. The next prime is 128699341. The reversal of 128699340 is 43996821.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 128699292 and 128699301.

It is not an unprimeable number, because it can be changed into a prime (128699341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 411024 + ... + 411336.

It is an arithmetic number, because the mean of its divisors is an integer number (2373840).

Almost surely, 2^128699340 is an apocalyptic number.

128699340 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 128699340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227888640).

128699340 is an abundant number, since it is smaller than the sum of its proper divisors (327077940).

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

128699340 is a wasteful number, since it uses less digits than its factorization.

128699340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432 (or 430 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 128699340 is about 11344.5731519524. The cubic root of 128699340 is about 504.8845797065.

The spelling of 128699340 in words is "one hundred twenty-eight million, six hundred ninety-nine thousand, three hundred forty".