128530636 has 12 divisors (see below), whose sum is σ = 242230912. Its totient is φ = 59321808.

The previous prime is 128530579. The next prime is 128530663. The reversal of 128530636 is 636035821.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

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, 1235820 + ... + 1235923.

Almost surely, 2^128530636 is an apocalyptic number.

It is an amenable number.

128530636 is a deficient number, since it is larger than the sum of its proper divisors (113700276).

128530636 is a wasteful number, since it uses less digits than its factorization.

128530636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2471760 (or 2471758 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 128530636 is about 11337.1352642544. The cubic root of 128530636 is about 504.6638759261.

The spelling of 128530636 in words is "one hundred twenty-eight million, five hundred thirty thousand, six hundred thirty-six".