129020008 has 24 divisors (see below), whose sum is σ = 261955350. Its totient is φ = 59547072.

The previous prime is 129019973. The next prime is 129020009. The reversal of 129020008 is 800020921.

It can be written as a sum of positive squares in 3 ways, for example, as 87572164 + 41447844 = 9358^2 + 6438^2 .

It is not an unprimeable number, because it can be changed into a prime (129020009) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46363 + ... + 49066.

Almost surely, 2^129020008 is an apocalyptic number.

It is an amenable number.

129020008 is an abundant number, since it is smaller than the sum of its proper divisors (132935342).

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

129020008 is a wasteful number, since it uses less digits than its factorization.

129020008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95461 (or 95444 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 129020008 is about 11358.6974605366. The cubic root of 129020008 is about 505.3035563443.

Adding to 129020008 its reverse (800020921), we get a palindrome (929040929).

The spelling of 129020008 in words is "one hundred twenty-nine million, twenty thousand, eight".