204782390 has 8 divisors (see below), whose sum is σ = 368608320. Its totient is φ = 81912952.

The previous prime is 204782377. The next prime is 204782401. The reversal of 204782390 is 93287402.

204782390 is digitally balanced in base 3, 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 super-2 number, since 2×204782390² = 83871654508224200, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 204782390.

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, 10239110 + ... + 10239129.

It is an arithmetic number, because the mean of its divisors is an integer number (46076040).

Almost surely, 2^204782390 is an apocalyptic number.

204782390 is a deficient number, since it is larger than the sum of its proper divisors (163825930).

204782390 is a wasteful number, since it uses less digits than its factorization.

204782390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20478246.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 204782390 is about 14310.2197746925. The cubic root of 204782390 is about 589.4281445600.

The spelling of 204782390 in words is "two hundred four million, seven hundred eighty-two thousand, three hundred ninety".