260128945 has 4 divisors (see below), whose sum is σ = 312154740. Its totient is φ = 208103152.

The previous prime is 260128903. The next prime is 260128961. The reversal of 260128945 is 549821062.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37552384 + 222576561 = 6128^2 + 14919^2 .

It is a cyclic number.

It is not a de Polignac number, because 260128945 - 2²³ = 251740337 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26012890 + ... + 26012899.

It is an arithmetic number, because the mean of its divisors is an integer number (78038685).

Almost surely, 2^260128945 is an apocalyptic number.

It is an amenable number.

260128945 is a deficient number, since it is larger than the sum of its proper divisors (52025795).

260128945 is an equidigital number, since it uses as much as digits as its factorization.

260128945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52025794.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 260128945 is about 16128.5134156871. The cubic root of 260128945 is about 638.3559242452.

The spelling of 260128945 in words is "two hundred sixty million, one hundred twenty-eight thousand, nine hundred forty-five".