129012750 has 160 divisors (see below), whose sum is σ = 377822016. Its totient is φ = 32788800.

The previous prime is 129012733. The next prime is 129012757. The reversal of 129012750 is 57210921.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129012757) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 465612 + ... + 465888.

Almost surely, 2^129012750 is an apocalyptic number.

129012750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 129012750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188911008).

129012750 is an abundant number, since it is smaller than the sum of its proper divisors (248809266).

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

129012750 is a wasteful number, since it uses less digits than its factorization.

129012750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329 (or 310 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 129012750 is about 11358.3779651850. The cubic root of 129012750 is about 505.2940809096.

It can be divided in two parts, 12901 and 2750, that added together give a palindrome (15651).

The spelling of 129012750 in words is "one hundred twenty-nine million, twelve thousand, seven hundred fifty".