128335533447 has 64 divisors (see below), whose sum is σ = 195911608320. Its totient is φ = 74032963200.

The previous prime is 128335533439. The next prime is 128335533449. The reversal of 128335533447 is 744335533821.

It is a happy number.

It is not a de Polignac number, because 128335533447 - 2³ = 128335533439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128335533396 and 128335533405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128335533449) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15196008 + ... + 15204450.

It is an arithmetic number, because the mean of its divisors is an integer number (3061118880).

Almost surely, 2^128335533447 is an apocalyptic number.

128335533447 is a deficient number, since it is larger than the sum of its proper divisors (67576074873).

128335533447 is a wasteful number, since it uses less digits than its factorization.

128335533447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8764.

The product of its digits is 3628800, while the sum is 48.

The spelling of 128335533447 in words is "one hundred twenty-eight billion, three hundred thirty-five million, five hundred thirty-three thousand, four hundred forty-seven".