129882640 has 20 divisors (see below), whose sum is σ = 301977324. Its totient is φ = 51953024.

The previous prime is 129882637. The next prime is 129882647. The reversal of 129882640 is 46288921.

It can be written as a sum of positive squares in 2 ways, for example, as 43243776 + 86638864 = 6576^2 + 9308^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 129882593 and 129882602.

It is not an unprimeable number, because it can be changed into a prime (129882647) 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, 811687 + ... + 811846.

Almost surely, 2^129882640 is an apocalyptic number.

129882640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129882640 is an abundant number, since it is smaller than the sum of its proper divisors (172094684).

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

129882640 is a wasteful number, since it uses less digits than its factorization.

129882640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623546 (or 1623540 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 129882640 is about 11396.6065124668. The cubic root of 129882640 is about 506.4272144913.

It can be divided in two parts, 1298 and 82640, that added together give a palindrome (83938).

The spelling of 129882640 in words is "one hundred twenty-nine million, eight hundred eighty-two thousand, six hundred forty".