128658406 has 8 divisors (see below), whose sum is σ = 193816584. Its totient is φ = 64052880.

The previous prime is 128658353. The next prime is 128658421. The reversal of 128658406 is 604856821.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137580 + ... + 138511.

It is an arithmetic number, because the mean of its divisors is an integer number (24227073).

Almost surely, 2^128658406 is an apocalyptic number.

128658406 is a deficient number, since it is larger than the sum of its proper divisors (65158178).

128658406 is a wasteful number, since it uses less digits than its factorization.

128658406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276326.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 128658406 is about 11342.7688859467. The cubic root of 128658406 is about 504.8310463139.

The spelling of 128658406 in words is "one hundred twenty-eight million, six hundred fifty-eight thousand, four hundred six".