128617456 has 20 divisors (see below), whose sum is σ = 271850904. Its totient is φ = 58462400.

The previous prime is 128617417. The next prime is 128617457. The reversal of 128617456 is 654716821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128617457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365215 + ... + 365566.

Almost surely, 2^128617456 is an apocalyptic number.

128617456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128617456 is an abundant number, since it is smaller than the sum of its proper divisors (143233448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128617456 is a wasteful number, since it uses less digits than its factorization.

128617456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730800 (or 730794 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The square root of 128617456 is about 11340.9636274877. The cubic root of 128617456 is about 504.7774806339. Note that the first 3 decimals are identical.

The spelling of 128617456 in words is "one hundred twenty-eight million, six hundred seventeen thousand, four hundred fifty-six".