3205128205 has 8 divisors (see below), whose sum is σ = 3846713112. Its totient is φ = 2563729728.

The previous prime is 3205128193. The next prime is 3205128229. The reversal of 3205128205 is 5028215023.

It can be written as a sum of positive squares in 4 ways, for example, as 1660481001 + 1544647204 = 40749^2 + 39302^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 3205128205 - 2⁹ = 3205127693 is a prime.

It is a Duffinian number.

3205128205 is a modest number, since divided by 128205 gives 3205 as remainder.

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, 5482 + ... + 80251.

It is an arithmetic number, because the mean of its divisors is an integer number (480839139).

Almost surely, 2^3205128205 is an apocalyptic number.

It is an amenable number.

3205128205 is a deficient number, since it is larger than the sum of its proper divisors (641584907).

3205128205 is an equidigital number, since it uses as much as digits as its factorization.

3205128205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93215.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 3205128205 is about 56613.8517060975. The cubic root of 3205128205 is about 1474.3993655227.

The spelling of 3205128205 in words is "three billion, two hundred five million, one hundred twenty-eight thousand, two hundred five".