128607381 has 12 divisors (see below), whose sum is σ = 212304352. Its totient is φ = 73489896.

The previous prime is 128607361. The next prime is 128607407. The reversal of 128607381 is 183706821.

128607381 is a `hidden beast` number, since 12 + 8 + 607 + 38 + 1 = 666.

It is not a de Polignac number, because 128607381 - 2⁶ = 128607317 is a prime.

It is a super-2 number, since 2×128607381² = 33079716895358322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128607331) 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, 1020631 + ... + 1020756.

Almost surely, 2^128607381 is an apocalyptic number.

It is an amenable number.

128607381 is a deficient number, since it is larger than the sum of its proper divisors (83696971).

128607381 is a wasteful number, since it uses less digits than its factorization.

128607381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041400 (or 2041397 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 128607381 is about 11340.5194325481. The cubic root of 128607381 is about 504.7643000334.

The spelling of 128607381 in words is "one hundred twenty-eight million, six hundred seven thousand, three hundred eighty-one".