128622691 has 8 divisors (see below), whose sum is σ = 131894784. Its totient is φ = 125373000.

The previous prime is 128622643. The next prime is 128622701. The reversal of 128622691 is 196226821.

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 128622691 - 2²³ = 120234083 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128622691.

It is not an unprimeable number, because it can be changed into a prime (128622631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6346 + ... + 17248.

It is an arithmetic number, because the mean of its divisors is an integer number (16486848).

Almost surely, 2^128622691 is an apocalyptic number.

128622691 is a deficient number, since it is larger than the sum of its proper divisors (3272093).

128622691 is a wasteful number, since it uses less digits than its factorization.

128622691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11201.

The product of its digits is 20736, while the sum is 37.

The square root of 128622691 is about 11341.1944256326. The cubic root of 128622691 is about 504.7843290414.

The spelling of 128622691 in words is "one hundred twenty-eight million, six hundred twenty-two thousand, six hundred ninety-one".