129687290 has 32 divisors (see below), whose sum is σ = 239345280. Its totient is φ = 50574784.

The previous prime is 129687289. The next prime is 129687307. The reversal of 129687290 is 92786921.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94187 + ... + 95553.

It is an arithmetic number, because the mean of its divisors is an integer number (7479540).

Almost surely, 2^129687290 is an apocalyptic number.

129687290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129687290 is a deficient number, since it is larger than the sum of its proper divisors (109657990).

129687290 is a wasteful number, since it uses less digits than its factorization.

129687290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 129687290 is about 11388.0327537288. The cubic root of 129687290 is about 506.1731897895.

The spelling of 129687290 in words is "one hundred twenty-nine million, six hundred eighty-seven thousand, two hundred ninety".