205864478 has 8 divisors (see below), whose sum is σ = 315978168. Its totient is φ = 100538424.

The previous prime is 205864423. The next prime is 205864481. The reversal of 205864478 is 874468502.

205864478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

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, 1196801 + ... + 1196972.

It is an arithmetic number, because the mean of its divisors is an integer number (39497271).

Almost surely, 2^205864478 is an apocalyptic number.

205864478 is a deficient number, since it is larger than the sum of its proper divisors (110113690).

205864478 is a wasteful number, since it uses less digits than its factorization.

205864478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2393818.

The product of its (nonzero) digits is 430080, while the sum is 44.

The square root of 205864478 is about 14347.9781850963. The cubic root of 205864478 is about 590.4645178347.

The spelling of 205864478 in words is "two hundred five million, eight hundred sixty-four thousand, four hundred seventy-eight".