129447552 has 64 divisors (see below), whose sum is σ = 370308960. Its totient is φ = 39828480.

The previous prime is 129447533. The next prime is 129447557. The reversal of 129447552 is 255744921.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 129447552.

It is not an unprimeable number, because it can be changed into a prime (129447557) 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, 7974 + ... + 17957.

Almost surely, 2^129447552 is an apocalyptic number.

129447552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129447552 is an abundant number, since it is smaller than the sum of its proper divisors (240861408).

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

129447552 is a wasteful number, since it uses less digits than its factorization.

129447552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25961 (or 25949 counting only the distinct ones).

The product of its digits is 100800, while the sum is 39.

The square root of 129447552 is about 11377.5020105470. The cubic root of 129447552 is about 505.8610959838.

The spelling of 129447552 in words is "one hundred twenty-nine million, four hundred forty-seven thousand, five hundred fifty-two".