129006720 has 96 divisors (see below), whose sum is σ = 445496220. Its totient is φ = 34400256.

The previous prime is 129006719. The next prime is 129006737. The reversal of 129006720 is 27600921.

It can be written as a sum of positive squares in 2 ways, for example, as 122412096 + 6594624 = 11064^2 + 2568^2 .

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5439 + ... + 16958.

Almost surely, 2^129006720 is an apocalyptic number.

129006720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129006720 is an abundant number, since it is smaller than the sum of its proper divisors (316489500).

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

129006720 is a wasteful number, since it uses less digits than its factorization.

129006720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22422 (or 22407 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 129006720 is about 11358.1125192525. The cubic root of 129006720 is about 505.2862083782.

The spelling of 129006720 in words is "one hundred twenty-nine million, six thousand, seven hundred twenty".