204749890 has 32 divisors (see below), whose sum is σ = 388696320. Its totient is φ = 77439744.

The previous prime is 204749879. The next prime is 204749939. The reversal of 204749890 is 98947402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185079 + ... + 186181.

It is an arithmetic number, because the mean of its divisors is an integer number (12146760).

Almost surely, 2^204749890 is an apocalyptic number.

204749890 is a deficient number, since it is larger than the sum of its proper divisors (183946430).

204749890 is a wasteful number, since it uses less digits than its factorization.

204749890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2106.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 204749890 is about 14309.0841775426. The cubic root of 204749890 is about 589.3969611687.

The spelling of 204749890 in words is "two hundred four million, seven hundred forty-nine thousand, eight hundred ninety".