129578496 has 80 divisors (see below), whose sum is σ = 357231600. Its totient is φ = 41689088.

The previous prime is 129578459. The next prime is 129578507. The reversal of 129578496 is 694875921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43090 + ... + 45998.

It is an arithmetic number, because the mean of its divisors is an integer number (4465395).

Almost surely, 2^129578496 is an apocalyptic number.

129578496 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129578496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178615800).

129578496 is an abundant number, since it is smaller than the sum of its proper divisors (227653104).

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

129578496 is an equidigital number, since it uses as much as digits as its factorization.

129578496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2959 (or 2943 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 51.

The square root of 129578496 is about 11383.2550704972. The cubic root of 129578496 is about 506.0316081637.

The spelling of 129578496 in words is "one hundred twenty-nine million, five hundred seventy-eight thousand, four hundred ninety-six".