205881428 has 6 divisors (see below), whose sum is σ = 360292506. Its totient is φ = 102940712.

The previous prime is 205881427. The next prime is 205881439. The reversal of 205881428 is 824188502.

It can be written as a sum of positive squares in only one way, i.e., 148303684 + 57577744 = 12178^2 + 7588^2 .

It is a junction number, because it is equal to n+sod(n) for n = 205881391 and 205881400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205881427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25735175 + ... + 25735182.

It is an arithmetic number, because the mean of its divisors is an integer number (60048751).

Almost surely, 2^205881428 is an apocalyptic number.

It is an amenable number.

205881428 is a deficient number, since it is larger than the sum of its proper divisors (154411078).

205881428 is a wasteful number, since it uses less digits than its factorization.

205881428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51470361 (or 51470359 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 38.

The square root of 205881428 is about 14348.5688484950. The cubic root of 205881428 is about 590.4807228304.

The spelling of 205881428 in words is "two hundred five million, eight hundred eighty-one thousand, four hundred twenty-eight".