1205558256 has 80 divisors (see below), whose sum is σ = 3674114048. Its totient is φ = 333331200.

The previous prime is 1205558251. The next prime is 1205558257. The reversal of 1205558256 is 6528555021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205558251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47455 + ... + 68286.

Almost surely, 2^1205558256 is an apocalyptic number.

1205558256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1205558256 is an abundant number, since it is smaller than the sum of its proper divisors (2468555792).

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

1205558256 is a wasteful number, since it uses less digits than its factorization.

1205558256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115790 (or 115784 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 39.

The square root of 1205558256 is about 34721.1499809554. The cubic root of 1205558256 is about 1064.2967448268.

The spelling of 1205558256 in words is "one billion, two hundred five million, five hundred fifty-eight thousand, two hundred fifty-six".