129685770 has 24 divisors (see below), whose sum is σ = 337183236. Its totient is φ = 34582848.

The previous prime is 129685763. The next prime is 129685783. The reversal of 129685770 is 77586921.

129685770 is a `hidden beast` number, since 12 + 9 + 68 + 577 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 128663649 + 1022121 = 11343^2 + 1011^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 720387 + ... + 720566.

Almost surely, 2^129685770 is an apocalyptic number.

129685770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129685770 is an abundant number, since it is smaller than the sum of its proper divisors (207497466).

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

129685770 is a wasteful number, since it uses less digits than its factorization.

129685770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440966 (or 1440963 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 129685770 is about 11387.9660168091. The cubic root of 129685770 is about 506.1712122473.

The spelling of 129685770 in words is "one hundred twenty-nine million, six hundred eighty-five thousand, seven hundred seventy".