128730564 has 18 divisors (see below), whose sum is σ = 325402350. Its totient is φ = 42910176.

The previous prime is 128730559. The next prime is 128730571. The reversal of 128730564 is 465037821.

128730564 is a `hidden beast` number, since 1 + 28 + 73 + 0 + 564 = 666.

It can be written as a sum of positive squares in only one way, i.e., 73822464 + 54908100 = 8592^2 + 7410^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 3575849 = 128730564 / (1 + 2 + 8 + 7 + 3 + 0 + 5 + 6 + 4).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1787889 + ... + 1787960.

Almost surely, 2^128730564 is an apocalyptic number.

It is an amenable number.

128730564 is an abundant number, since it is smaller than the sum of its proper divisors (196671786).

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

128730564 is a wasteful number, since it uses less digits than its factorization.

128730564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3575859 (or 3575854 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 128730564 is about 11345.9492330964. The cubic root of 128730564 is about 504.9254067519.

The spelling of 128730564 in words is "one hundred twenty-eight million, seven hundred thirty thousand, five hundred sixty-four".