129995680 has 24 divisors (see below), whose sum is σ = 307115172. Its totient is φ = 51998208.

The previous prime is 129995669. The next prime is 129995683. The reversal of 129995680 is 86599921.

It can be written as a sum of positive squares in 2 ways, for example, as 129686544 + 309136 = 11388^2 + 556^2 .

It is not an unprimeable number, because it can be changed into a prime (129995683) 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, 406077 + ... + 406396.

Almost surely, 2^129995680 is an apocalyptic number.

129995680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129995680 is an abundant number, since it is smaller than the sum of its proper divisors (177119492).

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

129995680 is an equidigital number, since it uses as much as digits as its factorization.

129995680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812488 (or 812480 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 49.

The square root of 129995680 is about 11401.5648048853. The cubic root of 129995680 is about 506.5740905035.

The spelling of 129995680 in words is "one hundred twenty-nine million, nine hundred ninety-five thousand, six hundred eighty".