129256448 has 22 divisors (see below), whose sum is σ = 258388716. Its totient is φ = 64627712.

The previous prime is 129256427. The next prime is 129256483. The reversal of 129256448 is 844652921.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62090 + ... + 64137.

Almost surely, 2^129256448 is an apocalyptic number.

It is an amenable number.

129256448 is a deficient number, since it is larger than the sum of its proper divisors (129132268).

129256448 is an equidigital number, since it uses as much as digits as its factorization.

129256448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126247 (or 126229 counting only the distinct ones).

The product of its digits is 138240, while the sum is 41.

The square root of 129256448 is about 11369.1005800811. The cubic root of 129256448 is about 505.6120383824.

The spelling of 129256448 in words is "one hundred twenty-nine million, two hundred fifty-six thousand, four hundred forty-eight".