129206070 has 128 divisors (see below), whose sum is σ = 397440000. Its totient is φ = 29258496.

The previous prime is 129206059. The next prime is 129206071. The reversal of 129206070 is 70602921.

129206070 = T₂₃₉ + T₂₄₀ + ... + T₉₂₃.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129206071) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 258681 + ... + 259179.

It is an arithmetic number, because the mean of its divisors is an integer number (3105000).

Almost surely, 2^129206070 is an apocalyptic number.

129206070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 129206070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198720000).

129206070 is an abundant number, since it is smaller than the sum of its proper divisors (268233930).

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

129206070 is a wasteful number, since it uses less digits than its factorization.

129206070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659 (or 653 counting only the distinct ones).

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

The square root of 129206070 is about 11366.8847975160. The cubic root of 129206070 is about 505.5463420255.

Adding to 129206070 its reverse (70602921), we get a palindrome (199808991).

The spelling of 129206070 in words is "one hundred twenty-nine million, two hundred six thousand, seventy".