129027552 has 96 divisors (see below), whose sum is σ = 361482912. Its totient is φ = 40157184.

The previous prime is 129027529. The next prime is 129027553. The reversal of 129027552 is 255720921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×129027552² = 33296218350225408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129027553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282108 + ... + 282564.

It is an arithmetic number, because the mean of its divisors is an integer number (3765447).

Almost surely, 2^129027552 is an apocalyptic number.

129027552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129027552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180741456).

129027552 is an abundant number, since it is smaller than the sum of its proper divisors (232455360).

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

129027552 is a wasteful number, since it uses less digits than its factorization.

129027552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660 (or 652 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 129027552 is about 11359.0295360123. The cubic root of 129027552 is about 505.3134047800.

The spelling of 129027552 in words is "one hundred twenty-nine million, twenty-seven thousand, five hundred fifty-two".