129322644 has 24 divisors (see below), whose sum is σ = 329185248. Its totient is φ = 39188640.

The previous prime is 129322643. The next prime is 129322649. The reversal of 129322644 is 446223921.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129322643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 489727 + ... + 489990.

It is an arithmetic number, because the mean of its divisors is an integer number (13716052).

Almost surely, 2^129322644 is an apocalyptic number.

It is an amenable number.

129322644 is an abundant number, since it is smaller than the sum of its proper divisors (199862604).

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

129322644 is a wasteful number, since it uses less digits than its factorization.

129322644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979735 (or 979733 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 129322644 is about 11372.0114315806. The cubic root of 129322644 is about 505.6983365467.

It can be divided in two parts, 12932 and 2644, that added together give a triangular number (15576 = T₁₇₆).

The spelling of 129322644 in words is "one hundred twenty-nine million, three hundred twenty-two thousand, six hundred forty-four".