129013668 has 72 divisors (see below), whose sum is σ = 389104800. Its totient is φ = 36859536.

The previous prime is 129013639. The next prime is 129013727. The reversal of 129013668 is 866310921.

129013668 is a `hidden beast` number, since 1 + 290 + 1 + 366 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6898 + ... + 17481.

Almost surely, 2^129013668 is an apocalyptic number.

129013668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

129013668 is an abundant number, since it is smaller than the sum of its proper divisors (260091132).

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

129013668 is a wasteful number, since it uses less digits than its factorization.

129013668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24406 (or 24391 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 129013668 is about 11358.4183758127. The cubic root of 129013668 is about 505.2952793929.

The spelling of 129013668 in words is "one hundred twenty-nine million, thirteen thousand, six hundred sixty-eight".