129640770 has 192 divisors, whose sum is σ = 413683200. Its totient is φ = 28788480.

The previous prime is 129640741. The next prime is 129640787. The reversal of 129640770 is 77046921.

It is a happy number.

129640770 is a `hidden beast` number, since 1 + 2 + 9 + 640 + 7 + 7 + 0 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 542311 + ... + 542549.

It is an arithmetic number, because the mean of its divisors is an integer number (2154600).

Almost surely, 2^129640770 is an apocalyptic number.

129640770 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 129640770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206841600).

129640770 is an abundant number, since it is smaller than the sum of its proper divisors (284042430).

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

129640770 is a wasteful number, since it uses less digits than its factorization.

129640770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310 (or 297 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 129640770 is about 11385.9900755270. The cubic root of 129640770 is about 506.1126595893.

The spelling of 129640770 in words is "one hundred twenty-nine million, six hundred forty thousand, seven hundred seventy".