128580381 has 12 divisors (see below), whose sum is σ = 186103008. Its totient is φ = 85546824.

The previous prime is 128580371. The next prime is 128580383. The reversal of 128580381 is 183085821.

It is not a de Polignac number, because 128580381 - 2⁵ = 128580349 is a prime.

It is a super-2 number, since 2×128580381² = 33065828756210322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128580383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9675 + ... + 18728.

It is an arithmetic number, because the mean of its divisors is an integer number (15508584).

Almost surely, 2^128580381 is an apocalyptic number.

It is an amenable number.

128580381 is a deficient number, since it is larger than the sum of its proper divisors (57522627).

128580381 is a wasteful number, since it uses less digits than its factorization.

128580381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28912 (or 28909 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 128580381 is about 11339.3289483990. The cubic root of 128580381 is about 504.7289739377.

The spelling of 128580381 in words is "one hundred twenty-eight million, five hundred eighty thousand, three hundred eighty-one".