129638546040 has 64 divisors (see below), whose sum is σ = 389268633600. Its totient is φ = 34538901632.

The previous prime is 129638546021. The next prime is 129638546057. The reversal of 129638546040 is 40645836921.

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, 357360 + ... + 622079.

It is an arithmetic number, because the mean of its divisors is an integer number (6082322400).

Almost surely, 2^129638546040 is an apocalyptic number.

129638546040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129638546040 is an abundant number, since it is smaller than the sum of its proper divisors (259630087560).

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

129638546040 is a wasteful number, since it uses less digits than its factorization.

129638546040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980556 (or 980552 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 48.

The spelling of 129638546040 in words is "one hundred twenty-nine billion, six hundred thirty-eight million, five hundred forty-six thousand, forty".