129455267780 has 96 divisors (see below), whose sum is σ = 283905742848. Its totient is φ = 49527936000.

The previous prime is 129455267771. The next prime is 129455267791. The reversal of 129455267780 is 87762554921.

It is a super-2 number, since 2×129455267780² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38378174 + ... + 38381546.

It is an arithmetic number, because the mean of its divisors is an integer number (2957351488).

Almost surely, 2^129455267780 is an apocalyptic number.

129455267780 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 129455267780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141952871424).

129455267780 is an abundant number, since it is smaller than the sum of its proper divisors (154450475068).

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

129455267780 is a wasteful number, since it uses less digits than its factorization.

129455267780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4117 (or 4115 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 56.

The spelling of 129455267780 in words is "one hundred twenty-nine billion, four hundred fifty-five million, two hundred sixty-seven thousand, seven hundred eighty".