129782640 has 80 divisors (see below), whose sum is σ = 433284768. Its totient is φ = 31945728.

The previous prime is 129782623. The next prime is 129782669. The reversal of 129782640 is 46287921.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17679 + ... + 23918.

Almost surely, 2^129782640 is an apocalyptic number.

129782640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129782640 is an abundant number, since it is smaller than the sum of its proper divisors (303502128).

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

129782640 is a wasteful number, since it uses less digits than its factorization.

129782640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41626 (or 41620 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 129782640 is about 11392.2183967830. The cubic root of 129782640 is about 506.2972106559.

The spelling of 129782640 in words is "one hundred twenty-nine million, seven hundred eighty-two thousand, six hundred forty".