128512464 has 20 divisors (see below), whose sum is σ = 331990656. Its totient is φ = 42837472.

The previous prime is 128512463. The next prime is 128512481. The reversal of 128512464 is 464215821.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128512463) 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, 1338624 + ... + 1338719.

Almost surely, 2^128512464 is an apocalyptic number.

It is an amenable number.

128512464 is an abundant number, since it is smaller than the sum of its proper divisors (203478192).

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

128512464 is a wasteful number, since it uses less digits than its factorization.

128512464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2677354 (or 2677348 counting only the distinct ones).

The product of its digits is 15360, while the sum is 33.

The square root of 128512464 is about 11336.3337988964. Note that the first 3 decimals coincide. The cubic root of 128512464 is about 504.6400912357.

The spelling of 128512464 in words is "one hundred twenty-eight million, five hundred twelve thousand, four hundred sixty-four".