129268339540 has 48 divisors (see below), whose sum is σ = 273299014800. Its totient is φ = 51357975552.

The previous prime is 129268339531. The next prime is 129268339589. The reversal of 129268339540 is 45933862921.

It can be written as a sum of positive squares in 8 ways, for example, as 5080516 + 129263259024 = 2254^2 + 359532^2 .

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, 10069846 + ... + 10082674.

It is an arithmetic number, because the mean of its divisors is an integer number (5693729475).

Almost surely, 2^129268339540 is an apocalyptic number.

129268339540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129268339540 is an abundant number, since it is smaller than the sum of its proper divisors (144030675260).

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

129268339540 is a wasteful number, since it uses less digits than its factorization.

129268339540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16204 (or 16202 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 52.

The spelling of 129268339540 in words is "one hundred twenty-nine billion, two hundred sixty-eight million, three hundred thirty-nine thousand, five hundred forty".