128880565 has 8 divisors (see below), whose sum is σ = 168716448. Its totient is φ = 93731280.

The previous prime is 128880539. The next prime is 128880571. The reversal of 128880565 is 565088821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128880565 - 2¹⁷ = 128749493 is a prime.

It is a super-2 number, since 2×128880565² = 33220400069438450, which contains 22 as substring.

It is a Duffinian number.

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, 1171587 + ... + 1171696.

It is an arithmetic number, because the mean of its divisors is an integer number (21089556).

Almost surely, 2^128880565 is an apocalyptic number.

It is an amenable number.

128880565 is a deficient number, since it is larger than the sum of its proper divisors (39835883).

128880565 is a wasteful number, since it uses less digits than its factorization.

128880565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2343299.

The product of its (nonzero) digits is 153600, while the sum is 43.

The square root of 128880565 is about 11352.5576413423. The cubic root of 128880565 is about 505.1214490764.

The spelling of 128880565 in words is "one hundred twenty-eight million, eight hundred eighty thousand, five hundred sixty-five".