128516530 has 16 divisors (see below), whose sum is σ = 231540120. Its totient is φ = 51359872.

The previous prime is 128516497. The next prime is 128516533. The reversal of 128516530 is 35615821.

It can be written as a sum of positive squares in 4 ways, for example, as 127035441 + 1481089 = 11271^2 + 1217^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128516492 and 128516501.

It is not an unprimeable number, because it can be changed into a prime (128516533) 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, 7062 + ... + 17518.

Almost surely, 2^128516530 is an apocalyptic number.

128516530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128516530 is a deficient number, since it is larger than the sum of its proper divisors (103023590).

128516530 is a wasteful number, since it uses less digits than its factorization.

128516530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11693.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 128516530 is about 11336.5131323525. The cubic root of 128516530 is about 504.6454132745.

The spelling of 128516530 in words is "one hundred twenty-eight million, five hundred sixteen thousand, five hundred thirty".