129028647 has 8 divisors (see below), whose sum is σ = 187678080. Its totient is φ = 78199160.

The previous prime is 129028633. The next prime is 129028673. The reversal of 129028647 is 746820921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129028647 - 2⁴ = 129028631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129028607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1954947 + ... + 1955012.

It is an arithmetic number, because the mean of its divisors is an integer number (23459760).

Almost surely, 2^129028647 is an apocalyptic number.

129028647 is a deficient number, since it is larger than the sum of its proper divisors (58649433).

129028647 is a wasteful number, since it uses less digits than its factorization.

129028647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3909973.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 129028647 is about 11359.0777354502. The cubic root of 129028647 is about 505.3148342334.

The spelling of 129028647 in words is "one hundred twenty-nine million, twenty-eight thousand, six hundred forty-seven".