129547428 has 12 divisors (see below), whose sum is σ = 302277360. Its totient is φ = 43182472.

The previous prime is 129547427. The next prime is 129547489. The reversal of 129547428 is 824745921.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×129547428² = 33565072202830368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 129547428.

It is not an unprimeable number, because it can be changed into a prime (129547427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5397798 + ... + 5397821.

It is an arithmetic number, because the mean of its divisors is an integer number (25189780).

Almost surely, 2^129547428 is an apocalyptic number.

It is an amenable number.

129547428 is an abundant number, since it is smaller than the sum of its proper divisors (172729932).

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

129547428 is a wasteful number, since it uses less digits than its factorization.

129547428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10795626 (or 10795624 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 129547428 is about 11381.8903526611. The cubic root of 129547428 is about 505.9911625467.

The spelling of 129547428 in words is "one hundred twenty-nine million, five hundred forty-seven thousand, four hundred twenty-eight".