129260448 has 96 divisors (see below), whose sum is σ = 381870720. Its totient is φ = 43063488.

The previous prime is 129260447. The next prime is 129260479. The reversal of 129260448 is 844062921.

129260448 is a `hidden beast` number, since 1 + 2 + 9 + 2 + 604 + 48 = 666.

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

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129260447) 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, 69061 + ... + 70907.

It is an arithmetic number, because the mean of its divisors is an integer number (3977820).

Almost surely, 2^129260448 is an apocalyptic number.

129260448 is a gapful number since it is divisible by the number (18) 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 129260448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190935360).

129260448 is an abundant number, since it is smaller than the sum of its proper divisors (252610272).

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

129260448 is an frugal number, since it uses more digits than its factorization.

129260448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878 (or 1852 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 129260448 is about 11369.2764941310. The cubic root of 129260448 is about 505.6172539244.

The spelling of 129260448 in words is "one hundred twenty-nine million, two hundred sixty thousand, four hundred forty-eight".