129273422460 has 384 divisors, whose sum is σ = 470654392320. Its totient is φ = 25745485824.

The previous prime is 129273422449. The next prime is 129273422513. The reversal of 129273422460 is 64224372921.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 30393694 + ... + 30397946.

It is an arithmetic number, because the mean of its divisors is an integer number (1225662480).

Almost surely, 2^129273422460 is an apocalyptic number.

129273422460 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 129273422460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235327196160).

129273422460 is an abundant number, since it is smaller than the sum of its proper divisors (341380969860).

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

129273422460 is a wasteful number, since it uses less digits than its factorization.

129273422460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4597 (or 4595 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 42.

The spelling of 129273422460 in words is "one hundred twenty-nine billion, two hundred seventy-three million, four hundred twenty-two thousand, four hundred sixty".