204578681 has 8 divisors (see below), whose sum is σ = 215477280. Its totient is φ = 193693248.

The previous prime is 204578677. The next prime is 204578683. The reversal of 204578681 is 186875402.

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

It is a cyclic number.

It is not a de Polignac number, because 204578681 - 2² = 204578677 is a prime.

It is a super-2 number, since 2×204578681² = 83704873439399522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204578683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59450 + ... + 62796.

It is an arithmetic number, because the mean of its divisors is an integer number (26934660).

Almost surely, 2^204578681 is an apocalyptic number.

It is an amenable number.

204578681 is a deficient number, since it is larger than the sum of its proper divisors (10898599).

204578681 is a wasteful number, since it uses less digits than its factorization.

204578681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6583.

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 204578681 is about 14303.1003981654. The cubic root of 204578681 is about 589.2326335201.

The spelling of 204578681 in words is "two hundred four million, five hundred seventy-eight thousand, six hundred eighty-one".