128724663 has 16 divisors (see below), whose sum is σ = 182545920. Its totient is φ = 80405376.

The previous prime is 128724647. The next prime is 128724667. The reversal of 128724663 is 366427821.

It is a happy number.

It is not a de Polignac number, because 128724663 - 2⁴ = 128724647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128724667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6018 + ... + 17136.

It is an arithmetic number, because the mean of its divisors is an integer number (11409120).

Almost surely, 2^128724663 is an apocalyptic number.

128724663 is a deficient number, since it is larger than the sum of its proper divisors (53821257).

128724663 is a wasteful number, since it uses less digits than its factorization.

128724663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11366.

The product of its digits is 96768, while the sum is 39.

The square root of 128724663 is about 11345.6891813587. The cubic root of 128724663 is about 504.9176913856.

The spelling of 128724663 in words is "one hundred twenty-eight million, seven hundred twenty-four thousand, six hundred sixty-three".