128517240 has 128 divisors (see below), whose sum is σ = 398099520. Its totient is φ = 33177600.

The previous prime is 128517203. The next prime is 128517251. The reversal of 128517240 is 42715821.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 128517198 and 128517207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 709950 + ... + 710130.

Almost surely, 2^128517240 is an apocalyptic number.

128517240 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 128517240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199049760).

128517240 is an abundant number, since it is smaller than the sum of its proper divisors (269582280).

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

128517240 is a wasteful number, since it uses less digits than its factorization.

128517240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353 (or 349 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 128517240 is about 11336.5444470526. The cubic root of 128517240 is about 504.6463425910.

The spelling of 128517240 in words is "one hundred twenty-eight million, five hundred seventeen thousand, two hundred forty".