129497322240 has 576 divisors, whose sum is σ = 539894638080. Its totient is φ = 28977315840.

The previous prime is 129497322217. The next prime is 129497322281. The reversal of 129497322240 is 42223794921.

129497322240 is a `hidden beast` number, since 1 + 294 + 97 + 32 + 2 + 240 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4928979 + ... + 4955181.

It is an arithmetic number, because the mean of its divisors is an integer number (937317080).

Almost surely, 2^129497322240 is an apocalyptic number.

129497322240 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 129497322240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269947319040).

129497322240 is an abundant number, since it is smaller than the sum of its proper divisors (410397315840).

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

129497322240 is a wasteful number, since it uses less digits than its factorization.

129497322240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26257 (or 26237 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 129497322240 in words is "one hundred twenty-nine billion, four hundred ninety-seven million, three hundred twenty-two thousand, two hundred forty".