128643368 has 16 divisors (see below), whose sum is σ = 275664480. Its totient is φ = 55132848.

The previous prime is 128643343. The next prime is 128643379. The reversal of 128643368 is 863346821.

It is a happy number.

It is a super-2 number, since 2×128643368² = 33098232260766848, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1148546 + ... + 1148657.

It is an arithmetic number, because the mean of its divisors is an integer number (17229030).

Almost surely, 2^128643368 is an apocalyptic number.

It is an amenable number.

128643368 is an abundant number, since it is smaller than the sum of its proper divisors (147021112).

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

128643368 is a wasteful number, since it uses less digits than its factorization.

128643368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2297216 (or 2297212 counting only the distinct ones).

The product of its digits is 165888, while the sum is 41.

The square root of 128643368 is about 11342.1059772866. The cubic root of 128643368 is about 504.8113767996.

The spelling of 128643368 in words is "one hundred twenty-eight million, six hundred forty-three thousand, three hundred sixty-eight".