128650521 has 8 divisors (see below), whose sum is σ = 172587040. Its totient is φ = 85240512.

The previous prime is 128650513. The next prime is 128650531. The reversal of 128650521 is 125056821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128650521 - 2³ = 128650513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128650531) 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, 131056 + ... + 132033.

It is an arithmetic number, because the mean of its divisors is an integer number (21573380).

Almost surely, 2^128650521 is an apocalyptic number.

It is an amenable number.

128650521 is a deficient number, since it is larger than the sum of its proper divisors (43936519).

128650521 is a wasteful number, since it uses less digits than its factorization.

128650521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263255.

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 128650521 is about 11342.4213023499. The cubic root of 128650521 is about 504.8207330245.

The spelling of 128650521 in words is "one hundred twenty-eight million, six hundred fifty thousand, five hundred twenty-one".