129778416 has 40 divisors (see below), whose sum is σ = 372513360. Its totient is φ = 43259328.

The previous prime is 129778399. The next prime is 129778427. The reversal of 129778416 is 614877921.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149775 + ... + 150638.

It is an arithmetic number, because the mean of its divisors is an integer number (9312834).

Almost surely, 2^129778416 is an apocalyptic number.

129778416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129778416 is an abundant number, since it is smaller than the sum of its proper divisors (242734944).

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

129778416 is a wasteful number, since it uses less digits than its factorization.

129778416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300430 (or 300418 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 129778416 is about 11392.0330055702. The cubic root of 129778416 is about 506.2917178241.

The spelling of 129778416 in words is "one hundred twenty-nine million, seven hundred seventy-eight thousand, four hundred sixteen".