128622879 has 72 divisors (see below), whose sum is σ = 239016960. Its totient is φ = 65213280.

The previous prime is 128622829. The next prime is 128622883. The reversal of 128622879 is 978226821.

128622879 is a `hidden beast` number, since 12 + 8 + 622 + 8 + 7 + 9 = 666.

It is not a de Polignac number, because 128622879 - 2⁸ = 128622623 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128622829) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 358102 + ... + 358460.

It is an arithmetic number, because the mean of its divisors is an integer number (3319680).

Almost surely, 2^128622879 is an apocalyptic number.

128622879 is a deficient number, since it is larger than the sum of its proper divisors (110394081).

128622879 is a wasteful number, since it uses less digits than its factorization.

128622879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441 (or 427 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 128622879 is about 11341.2027139982. The cubic root of 128622879 is about 504.7845749789.

The spelling of 128622879 in words is "one hundred twenty-eight million, six hundred twenty-two thousand, eight hundred seventy-nine".