128535864 has 32 divisors (see below), whose sum is σ = 324658320. Its totient is φ = 42402816.

The previous prime is 128535853. The next prime is 128535887. The reversal of 128535864 is 468535821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25279 + ... + 29934.

Almost surely, 2^128535864 is an apocalyptic number.

It is an amenable number.

128535864 is an abundant number, since it is smaller than the sum of its proper divisors (196122456).

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

128535864 is a wasteful number, since it uses less digits than its factorization.

128535864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55319 (or 55315 counting only the distinct ones).

The product of its digits is 230400, while the sum is 42.

The square root of 128535864 is about 11337.3658316207. The cubic root of 128535864 is about 504.6707182559.

The spelling of 128535864 in words is "one hundred twenty-eight million, five hundred thirty-five thousand, eight hundred sixty-four".