205128508 has 24 divisors (see below), whose sum is σ = 387078048. Its totient is φ = 94554816.

The previous prime is 205128463. The next prime is 205128509. The reversal of 205128508 is 805821502.

It is a self number, because there is not a number n which added to its sum of digits gives 205128508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205128509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49110 + ... + 53122.

It is an arithmetic number, because the mean of its divisors is an integer number (16128252).

Almost surely, 2^205128508 is an apocalyptic number.

It is an amenable number.

205128508 is a deficient number, since it is larger than the sum of its proper divisors (181949540).

205128508 is a wasteful number, since it uses less digits than its factorization.

205128508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5013 (or 5011 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 205128508 is about 14322.3080542209. The cubic root of 205128508 is about 589.7600364769.

The spelling of 205128508 in words is "two hundred five million, one hundred twenty-eight thousand, five hundred eight".