129684864 has 32 divisors (see below), whose sum is σ = 344476440. Its totient is φ = 43228160.

The previous prime is 129684859. The next prime is 129684869. The reversal of 129684864 is 468486921.

It is an interprime number because it is at equal distance from previous prime (129684859) and next prime (129684869).

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129684869) 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, 168477 + ... + 169244.

Almost surely, 2^129684864 is an apocalyptic number.

It is an amenable number.

129684864 is an abundant number, since it is smaller than the sum of its proper divisors (214791576).

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

129684864 is an equidigital number, since it uses as much as digits as its factorization.

129684864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337738 (or 337726 counting only the distinct ones).

The product of its digits is 663552, while the sum is 48.

The square root of 129684864 is about 11387.9262379065. The cubic root of 129684864 is about 506.1700335208.

The spelling of 129684864 in words is "one hundred twenty-nine million, six hundred eighty-four thousand, eight hundred sixty-four".