128730565 has 16 divisors (see below), whose sum is σ = 160548480. Its totient is φ = 98969920.

The previous prime is 128730559. The next prime is 128730571. The reversal of 128730565 is 565037821.

It is an interprime number because it is at equal distance from previous prime (128730559) and next prime (128730571).

It is not a de Polignac number, because 128730565 - 2²¹ = 126633413 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30960 + ... + 34870.

It is an arithmetic number, because the mean of its divisors is an integer number (10034280).

Almost surely, 2^128730565 is an apocalyptic number.

It is an amenable number.

128730565 is a deficient number, since it is larger than the sum of its proper divisors (31817915).

128730565 is a wasteful number, since it uses less digits than its factorization.

128730565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4172.

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 128730565 is about 11345.9492771650. The cubic root of 128730565 is about 504.9254080594.

The spelling of 128730565 in words is "one hundred twenty-eight million, seven hundred thirty thousand, five hundred sixty-five".