129070646 has 4 divisors (see below), whose sum is σ = 193605972. Its totient is φ = 64535322.

The previous prime is 129070637. The next prime is 129070651. The reversal of 129070646 is 646070921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 646070921 = 83 ⋅7783987.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32267660 + ... + 32267663.

It is an arithmetic number, because the mean of its divisors is an integer number (48401493).

Almost surely, 2^129070646 is an apocalyptic number.

129070646 is a deficient number, since it is larger than the sum of its proper divisors (64535326).

129070646 is an equidigital number, since it uses as much as digits as its factorization.

129070646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64535325.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 129070646 is about 11360.9262826585. The cubic root of 129070646 is about 505.3696551742.

The spelling of 129070646 in words is "one hundred twenty-nine million, seventy thousand, six hundred forty-six".