128917564 has 12 divisors (see below), whose sum is σ = 225767304. Its totient is φ = 64412624.

The previous prime is 128917543. The next prime is 128917577. The reversal of 128917564 is 465719821.

It is a self number, because there is not a number n which added to its sum of digits gives 128917564.

It is a congruent number.

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, 4822 + ... + 16765.

It is an arithmetic number, because the mean of its divisors is an integer number (18813942).

Almost surely, 2^128917564 is an apocalyptic number.

It is an amenable number.

128917564 is a deficient number, since it is larger than the sum of its proper divisors (96849740).

128917564 is a wasteful number, since it uses less digits than its factorization.

128917564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23084 (or 23082 counting only the distinct ones).

The product of its digits is 120960, while the sum is 43.

The square root of 128917564 is about 11354.1870690948. The cubic root of 128917564 is about 505.1697811643.

The spelling of 128917564 in words is "one hundred twenty-eight million, nine hundred seventeen thousand, five hundred sixty-four".