205675638 has 48 divisors (see below), whose sum is σ = 493968384. Its totient is φ = 56866320.

The previous prime is 205675621. The next prime is 205675649. The reversal of 205675638 is 836576502.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 205675638.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 2170 + ... + 20397.

It is an arithmetic number, because the mean of its divisors is an integer number (10291008).

Almost surely, 2^205675638 is an apocalyptic number.

205675638 is an abundant number, since it is smaller than the sum of its proper divisors (288292746).

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

205675638 is a wasteful number, since it uses less digits than its factorization.

205675638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22617 (or 22610 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 42.

The square root of 205675638 is about 14341.3959571584. The cubic root of 205675638 is about 590.2839177427.

The spelling of 205675638 in words is "two hundred five million, six hundred seventy-five thousand, six hundred thirty-eight".