129766026 has 32 divisors (see below), whose sum is σ = 282078720. Its totient is φ = 39559104.

The previous prime is 129766009. The next prime is 129766033. The reversal of 129766026 is 620667921.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 871 + ... + 16133.

It is an arithmetic number, because the mean of its divisors is an integer number (8814960).

Almost surely, 2^129766026 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129766026, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141039360).

129766026 is an abundant number, since it is smaller than the sum of its proper divisors (152312694).

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

129766026 is a wasteful number, since it uses less digits than its factorization.

129766026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15390.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 129766026 is about 11391.4891914973. The cubic root of 129766026 is about 506.2756053502.

The spelling of 129766026 in words is "one hundred twenty-nine million, seven hundred sixty-six thousand, twenty-six".