128650664 has 16 divisors (see below), whose sum is σ = 244127520. Its totient is φ = 63550000.

The previous prime is 128650649. The next prime is 128650693. The reversal of 128650664 is 466056821.

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, 96212 + ... + 97539.

It is an arithmetic number, because the mean of its divisors is an integer number (15257970).

Almost surely, 2^128650664 is an apocalyptic number.

It is an amenable number.

128650664 is a deficient number, since it is larger than the sum of its proper divisors (115476856).

128650664 is a wasteful number, since it uses less digits than its factorization.

128650664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193840 (or 193836 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 128650664 is about 11342.4276061168. The cubic root of 128650664 is about 504.8209200670.

The spelling of 128650664 in words is "one hundred twenty-eight million, six hundred fifty thousand, six hundred sixty-four".