129657270 has 32 divisors (see below), whose sum is σ = 311662080. Its totient is φ = 34521440.

The previous prime is 129657259. The next prime is 129657301. The reversal of 129657270 is 72756921.

It is a super-2 number, since 2×129657270² = 33622015327705800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18565 + ... + 24575.

It is an arithmetic number, because the mean of its divisors is an integer number (9739440).

Almost surely, 2^129657270 is an apocalyptic number.

129657270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129657270 is an abundant number, since it is smaller than the sum of its proper divisors (182004810).

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

129657270 is a wasteful number, since it uses less digits than its factorization.

129657270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6740.

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 129657270 is about 11386.7146271433. The cubic root of 129657270 is about 506.1341304703.

The spelling of 129657270 in words is "one hundred twenty-nine million, six hundred fifty-seven thousand, two hundred seventy".