129494880 has 144 divisors (see below), whose sum is σ = 465257520. Its totient is φ = 32707584.

The previous prime is 129494879. The next prime is 129494881. The reversal of 129494880 is 88494921.

129494880 is a `hidden beast` number, since 129 + 49 + 488 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (129494879) and next prime (129494881).

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129494881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24994 + ... + 29726.

It is an arithmetic number, because the mean of its divisors is an integer number (3230955).

Almost surely, 2^129494880 is an apocalyptic number.

129494880 is a gapful number since it is divisible by the number (10) 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 129494880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232628760).

129494880 is an abundant number, since it is smaller than the sum of its proper divisors (335762640).

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

129494880 is a wasteful number, since it uses less digits than its factorization.

129494880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4773 (or 4762 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 129494880 is about 11379.5817146326. The cubic root of 129494880 is about 505.9227386501.

The spelling of 129494880 in words is "one hundred twenty-nine million, four hundred ninety-four thousand, eight hundred eighty".