205872656 has 40 divisors (see below), whose sum is σ = 437141664. Its totient is φ = 93148160.

The previous prime is 205872649. The next prime is 205872713. The reversal of 205872656 is 656278502.

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 7 ways as a sum of consecutive naturals, for example, 37376 + ... + 42528.

Almost surely, 2^205872656 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 205872656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218570832).

205872656 is an abundant number, since it is smaller than the sum of its proper divisors (231269008).

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

205872656 is a wasteful number, since it uses less digits than its factorization.

205872656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5399 (or 5393 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 41.

The square root of 205872656 is about 14348.2631701541. The cubic root of 205872656 is about 590.4723364976.

The spelling of 205872656 in words is "two hundred five million, eight hundred seventy-two thousand, six hundred fifty-six".