129027256 has 8 divisors (see below), whose sum is σ = 241926120. Its totient is φ = 64513624.

The previous prime is 129027253. The next prime is 129027259. The reversal of 129027256 is 652720921.

It is an interprime number because it is at equal distance from previous prime (129027253) and next prime (129027259).

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129027253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8064196 + ... + 8064211.

It is an arithmetic number, because the mean of its divisors is an integer number (30240765).

Almost surely, 2^129027256 is an apocalyptic number.

It is an amenable number.

129027256 is a deficient number, since it is larger than the sum of its proper divisors (112898864).

129027256 is a wasteful number, since it uses less digits than its factorization.

129027256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16128413 (or 16128409 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 129027256 is about 11359.0165067228. The cubic root of 129027256 is about 505.3130183693.

The spelling of 129027256 in words is "one hundred twenty-nine million, twenty-seven thousand, two hundred fifty-six".