129639429720 has 512 divisors, whose sum is σ = 465454080000. Its totient is φ = 31998924288.

The previous prime is 129639429709. The next prime is 129639429761. The reversal of 129639429720 is 27924936921.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 175425111 + ... + 175425849.

It is an arithmetic number, because the mean of its divisors is an integer number (909090000).

Almost surely, 2^129639429720 is an apocalyptic number.

129639429720 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 129639429720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232727040000).

129639429720 is an abundant number, since it is smaller than the sum of its proper divisors (335814650280).

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

129639429720 is a wasteful number, since it uses less digits than its factorization.

129639429720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964 (or 954 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 54.

The spelling of 129639429720 in words is "one hundred twenty-nine billion, six hundred thirty-nine million, four hundred twenty-nine thousand, seven hundred twenty".