204890756 has 72 divisors (see below), whose sum is σ = 451221120. Its totient is φ = 80885952.

The previous prime is 204890747. The next prime is 204890767. The reversal of 204890756 is 657098402.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 137045 + ... + 138531.

It is an arithmetic number, because the mean of its divisors is an integer number (6266960).

Almost surely, 2^204890756 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204890756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225610560).

204890756 is an abundant number, since it is smaller than the sum of its proper divisors (246330364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204890756 is a wasteful number, since it uses less digits than its factorization.

204890756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561 (or 1552 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 204890756 is about 14314.0055889328. The cubic root of 204890756 is about 589.5320967061.

The spelling of 204890756 in words is "two hundred four million, eight hundred ninety thousand, seven hundred fifty-six".