129284020 has 12 divisors (see below), whose sum is σ = 271496484. Its totient is φ = 51713600.

The previous prime is 129284017. The next prime is 129284021. The reversal of 129284020 is 20482921.

It can be written as a sum of positive squares in 2 ways, for example, as 36893476 + 92390544 = 6074^2 + 9612^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 129284020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129284021) 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 3 ways as a sum of consecutive naturals, for example, 3232081 + ... + 3232120.

It is an arithmetic number, because the mean of its divisors is an integer number (22624707).

Almost surely, 2^129284020 is an apocalyptic number.

129284020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129284020 is an abundant number, since it is smaller than the sum of its proper divisors (142212464).

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

129284020 is a wasteful number, since it uses less digits than its factorization.

129284020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6464210 (or 6464208 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 129284020 is about 11370.3131003504. The cubic root of 129284020 is about 505.6479869281.

The spelling of 129284020 in words is "one hundred twenty-nine million, two hundred eighty-four thousand, twenty".