129296896 has 20 divisors (see below), whose sum is σ = 258342282. Its totient is φ = 64648192.

The previous prime is 129296873. The next prime is 129296897. The reversal of 129296896 is 698692921.

It can be written as a sum of positive squares in only one way, i.e., 70560000 + 58736896 = 8400^2 + 7664^2 .

It is not an unprimeable number, because it can be changed into a prime (129296897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125755 + ... + 126778.

Almost surely, 2^129296896 is an apocalyptic number.

129296896 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129296896 is a deficient number, since it is larger than the sum of its proper divisors (129045386).

129296896 is an frugal number, since it uses more digits than its factorization.

129296896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252551 (or 252535 counting only the distinct ones).

The product of its digits is 839808, while the sum is 52.

The square root of 129296896 is about 11370.8792975741. The cubic root of 129296896 is about 505.6647729866.

It can be divided in two parts, 129 and 296896, that added together give a square (297025 = 545²).

The spelling of 129296896 in words is "one hundred twenty-nine million, two hundred ninety-six thousand, eight hundred ninety-six".