129781488 has 20 divisors (see below), whose sum is σ = 335268968. Its totient is φ = 43260480.

The previous prime is 129781453. The next prime is 129781489. The reversal of 129781488 is 884187921.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 2703781 = 129781488 / (1 + 2 + 9 + 7 + 8 + 1 + 4 + 8 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129781489) 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, 1351843 + ... + 1351938.

Almost surely, 2^129781488 is an apocalyptic number.

It is an amenable number.

129781488 is an abundant number, since it is smaller than the sum of its proper divisors (205487480).

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

129781488 is a wasteful number, since it uses less digits than its factorization.

129781488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2703792 (or 2703786 counting only the distinct ones).

The product of its digits is 258048, while the sum is 48.

The square root of 129781488 is about 11392.1678358423. The cubic root of 129781488 is about 506.2957126227.

The spelling of 129781488 in words is "one hundred twenty-nine million, seven hundred eighty-one thousand, four hundred eighty-eight".