129783816 has 64 divisors (see below), whose sum is σ = 372960000. Its totient is φ = 41767488.

The previous prime is 129783809. The next prime is 129783833. The reversal of 129783816 is 618387921.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4096 + ... + 16623.

It is an arithmetic number, because the mean of its divisors is an integer number (5827500).

Almost surely, 2^129783816 is an apocalyptic number.

It is an amenable number.

129783816 is an abundant number, since it is smaller than the sum of its proper divisors (243176184).

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

129783816 is a wasteful number, since it uses less digits than its factorization.

129783816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20763 (or 20753 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 129783816 is about 11392.2700108451. The cubic root of 129783816 is about 506.2987398890.

The spelling of 129783816 in words is "one hundred twenty-nine million, seven hundred eighty-three thousand, eight hundred sixteen".