128622861 has 24 divisors (see below), whose sum is σ = 189841080. Its totient is φ = 83897856.

The previous prime is 128622829. The next prime is 128622883. The reversal of 128622861 is 168226821.

128622861 is a `hidden beast` number, since 1 + 28 + 622 + 8 + 6 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5546025 + 123076836 = 2355^2 + 11094^2 .

It is not a de Polignac number, because 128622861 - 2⁵ = 128622829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128642861) 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 23 ways as a sum of consecutive naturals, for example, 89295 + ... + 90723.

It is an arithmetic number, because the mean of its divisors is an integer number (7910045).

Almost surely, 2^128622861 is an apocalyptic number.

It is an amenable number.

128622861 is a deficient number, since it is larger than the sum of its proper divisors (61218219).

128622861 is a wasteful number, since it uses less digits than its factorization.

128622861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1645 (or 1642 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 128622861 is about 11341.2019204315. The cubic root of 128622861 is about 504.7845514317.

The spelling of 128622861 in words is "one hundred twenty-eight million, six hundred twenty-two thousand, eight hundred sixty-one".