128688051 has 8 divisors (see below), whose sum is σ = 177500880. Its totient is φ = 82833632.

The previous prime is 128688031. The next prime is 128688061. The reversal of 128688051 is 150886821.

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

It is a cyclic number.

It is not a de Polignac number, because 128688051 - 2⁵ = 128688019 is a prime.

It is a super-2 number, since 2×128688051² = 33121228940357202, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128688031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 739500 + ... + 739673.

It is an arithmetic number, because the mean of its divisors is an integer number (22187610).

Almost surely, 2^128688051 is an apocalyptic number.

128688051 is a deficient number, since it is larger than the sum of its proper divisors (48812829).

128688051 is a wasteful number, since it uses less digits than its factorization.

128688051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1479205.

The product of its (nonzero) digits is 30720, while the sum is 39.

The square root of 128688051 is about 11344.0755903687. The cubic root of 128688051 is about 504.8698171115.

The spelling of 128688051 in words is "one hundred twenty-eight million, six hundred eighty-eight thousand, fifty-one".