129299828 has 18 divisors (see below), whose sum is σ = 263217906. Its totient is φ = 55414128.

The previous prime is 129299827. The next prime is 129299831. The reversal of 129299828 is 828992921.

It can be written as a sum of positive squares in only one way, i.e., 126382564 + 2917264 = 11242^2 + 1708^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129299827) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 329651 + ... + 330042.

It is an arithmetic number, because the mean of its divisors is an integer number (14623217).

Almost surely, 2^129299828 is an apocalyptic number.

It is an amenable number.

129299828 is an abundant number, since it is smaller than the sum of its proper divisors (133918078).

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

129299828 is a wasteful number, since it uses less digits than its factorization.

129299828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659711 (or 659702 counting only the distinct ones).

The product of its digits is 373248, while the sum is 50.

The square root of 129299828 is about 11371.0082226687. The cubic root of 129299828 is about 505.6685951920.

The spelling of 129299828 in words is "one hundred twenty-nine million, two hundred ninety-nine thousand, eight hundred twenty-eight".