128136447 has 12 divisors (see below), whose sum is σ = 185242720. Its totient is φ = 85351968.

The previous prime is 128136403. The next prime is 128136451. The reversal of 128136447 is 744631821.

128136447 is a `hidden beast` number, since 1 + 2 + 8 + 1 + 3 + 644 + 7 = 666.

It is not a de Polignac number, because 128136447 - 2⁶ = 128136383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128136347) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6579 + ... + 17307.

Almost surely, 2^128136447 is an apocalyptic number.

128136447 is a deficient number, since it is larger than the sum of its proper divisors (57106273).

128136447 is a wasteful number, since it uses less digits than its factorization.

128136447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12062 (or 12059 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 128136447 is about 11319.7370552500. The cubic root of 128136447 is about 504.1474318307.

The spelling of 128136447 in words is "one hundred twenty-eight million, one hundred thirty-six thousand, four hundred forty-seven".