129783401280 has 336 divisors, whose sum is σ = 495780730560. Its totient is φ = 31946323968.

The previous prime is 129783401269. The next prime is 129783401281. The reversal of 129783401280 is 82104387921.

It is a happy number.

129783401280 is a `hidden beast` number, since 1 + 2 + 97 + 83 + 401 + 2 + 80 = 666.

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 (129783401281) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1415719 + ... + 1504601.

Almost surely, 2^129783401280 is an apocalyptic number.

129783401280 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 129783401280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247890365280).

129783401280 is an abundant number, since it is smaller than the sum of its proper divisors (365997329280).

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

129783401280 is a wasteful number, since it uses less digits than its factorization.

129783401280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88935 (or 88906 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 129783401280 in words is "one hundred twenty-nine billion, seven hundred eighty-three million, four hundred one thousand, two hundred eighty".