128294032520 has 16 divisors (see below), whose sum is σ = 288661573260. Its totient is φ = 51317612992.

The previous prime is 128294032511. The next prime is 128294032543. The reversal of 128294032520 is 25230492821.

It can be written as a sum of positive squares in 2 ways, for example, as 115704743716 + 12589288804 = 340154^2 + 112202^2 .

It is a super-3 number, since 3×128294032520³ (a number of 34 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1603675367 + ... + 1603675446.

Almost surely, 2^128294032520 is an apocalyptic number.

128294032520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128294032520 is an abundant number, since it is smaller than the sum of its proper divisors (160367540740).

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

128294032520 is a wasteful number, since it uses less digits than its factorization.

128294032520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3207350824 (or 3207350820 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 128294032520 in words is "one hundred twenty-eight billion, two hundred ninety-four million, thirty-two thousand, five hundred twenty".