129958816 has 24 divisors (see below), whose sum is σ = 275538564. Its totient is φ = 59980800.

The previous prime is 129958813. The next prime is 129958817. The reversal of 129958816 is 618859921.

It can be written as a sum of positive squares in 2 ways, for example, as 129868816 + 90000 = 11396^2 + 300^2 .

It is a super-2 number, since 2×129958816² = 33778587712243712, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 129958816.

It is not an unprimeable number, because it can be changed into a prime (129958813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155785 + ... + 156616.

Almost surely, 2^129958816 is an apocalyptic number.

129958816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129958816 is an abundant number, since it is smaller than the sum of its proper divisors (145579748).

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

129958816 is a wasteful number, since it uses less digits than its factorization.

129958816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312424 (or 312416 counting only the distinct ones).

The product of its digits is 311040, while the sum is 49.

The square root of 129958816 is about 11399.9480700572. The cubic root of 129958816 is about 506.5262014435.

The spelling of 129958816 in words is "one hundred twenty-nine million, nine hundred fifty-eight thousand, eight hundred sixteen".