205478638 has 8 divisors (see below), whose sum is σ = 308324232. Its totient is φ = 102703896.

The previous prime is 205478629. The next prime is 205478641. The reversal of 205478638 is 836874502.

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

It is a junction number, because it is equal to n+sod(n) for n = 205478594 and 205478603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9745 + ... + 22492.

It is an arithmetic number, because the mean of its divisors is an integer number (38540529).

Almost surely, 2^205478638 is an apocalyptic number.

205478638 is a deficient number, since it is larger than the sum of its proper divisors (102845594).

205478638 is a wasteful number, since it uses less digits than its factorization.

205478638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35426.

The product of its (nonzero) digits is 322560, while the sum is 43.

The square root of 205478638 is about 14334.5260821556. The cubic root of 205478638 is about 590.0953958551.

It can be divided in two parts, 205478 and 638, that added together give a square (206116 = 454²).

The spelling of 205478638 in words is "two hundred five million, four hundred seventy-eight thousand, six hundred thirty-eight".