129051828 has 36 divisors (see below), whose sum is σ = 345405060. Its totient is φ = 40486656.

The previous prime is 129051817. The next prime is 129051829. The reversal of 129051828 is 828150921.

It can be written as a sum of positive squares in 2 ways, for example, as 111260304 + 17791524 = 10548^2 + 4218^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 129051792 and 129051801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129051829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104823 + ... + 106046.

It is an arithmetic number, because the mean of its divisors is an integer number (9594585).

Almost surely, 2^129051828 is an apocalyptic number.

129051828 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

129051828 is an abundant number, since it is smaller than the sum of its proper divisors (216353232).

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

129051828 is a wasteful number, since it uses less digits than its factorization.

129051828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210896 (or 210891 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 129051828 is about 11360.0980629570. The cubic root of 129051828 is about 505.3450936681.

The spelling of 129051828 in words is "one hundred twenty-nine million, fifty-one thousand, eight hundred twenty-eight".