129740280 has 64 divisors (see below), whose sum is σ = 390039840. Its totient is φ = 34524672.

The previous prime is 129740269. The next prime is 129740291. The reversal of 129740280 is 82047921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (129740269) and next prime (129740291).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80442 + ... + 82038.

Almost surely, 2^129740280 is an apocalyptic number.

129740280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129740280 is an abundant number, since it is smaller than the sum of its proper divisors (260299560).

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

129740280 is a wasteful number, since it uses less digits than its factorization.

129740280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2288 (or 2284 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 129740280 is about 11390.3590812581. The cubic root of 129740280 is about 506.2421208955.

The spelling of 129740280 in words is "one hundred twenty-nine million, seven hundred forty thousand, two hundred eighty".