128967726 has 8 divisors (see below), whose sum is σ = 257935464. Its totient is φ = 42989240.

The previous prime is 128967701. The next prime is 128967731. The reversal of 128967726 is 627769821.

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

128967726 is an admirable number.

It is a super-2 number, since 2×128967726² = 33265348699222152, which contains 22 as substring.

It is a Curzon number.

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, 10747305 + ... + 10747316.

It is an arithmetic number, because the mean of its divisors is an integer number (32241933).

Almost surely, 2^128967726 is an apocalyptic number.

128967726 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128967726 is a wasteful number, since it uses less digits than its factorization.

128967726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21494626.

The product of its digits is 508032, while the sum is 48.

The square root of 128967726 is about 11356.3958190968. The cubic root of 128967726 is about 505.2352934183.

The spelling of 128967726 in words is "one hundred twenty-eight million, nine hundred sixty-seven thousand, seven hundred twenty-six".