129487011840 has 612 divisors, whose sum is σ = 474903787176. Its totient is φ = 32630636544.

The previous prime is 129487011683. The next prime is 129487011847. The reversal of 129487011840 is 48110784921.

129487011840 is a `hidden beast` number, since 12 + 9 + 487 + 0 + 118 + 40 = 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 (129487011847) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1560084439 + ... + 1560084521.

Almost surely, 2^129487011840 is an apocalyptic number.

129487011840 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 129487011840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237451893588).

129487011840 is an abundant number, since it is smaller than the sum of its proper divisors (345416775336).

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

129487011840 is an frugal number, since it uses more digits than its factorization.

129487011840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The spelling of 129487011840 in words is "one hundred twenty-nine billion, four hundred eighty-seven million, eleven thousand, eight hundred forty".