205612890 has 32 divisors (see below), whose sum is σ = 563967360. Its totient is φ = 46997184.

The previous prime is 205612867. The next prime is 205612907. The reversal of 205612890 is 98216502.

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 15 ways as a sum of consecutive naturals, for example, 489345 + ... + 489764.

It is an arithmetic number, because the mean of its divisors is an integer number (17623980).

Almost surely, 2^205612890 is an apocalyptic number.

205612890 is an abundant number, since it is smaller than the sum of its proper divisors (358354470).

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

205612890 is a wasteful number, since it uses less digits than its factorization.

205612890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979126.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 205612890 is about 14339.2081371323. The cubic root of 205612890 is about 590.2238832422.

The spelling of 205612890 in words is "two hundred five million, six hundred twelve thousand, eight hundred ninety".