256550658 has 64 divisors (see below), whose sum is σ = 633400320. Its totient is φ = 67459392.

The previous prime is 256550641. The next prime is 256550659. The reversal of 256550658 is 856055652.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (256550659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 298233 + ... + 299091.

It is an arithmetic number, because the mean of its divisors is an integer number (9896880).

Almost surely, 2^256550658 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256550658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (316700160).

256550658 is an abundant number, since it is smaller than the sum of its proper divisors (376849662).

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

256550658 is a wasteful number, since it uses less digits than its factorization.

256550658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431.

The product of its (nonzero) digits is 360000, while the sum is 42.

The square root of 256550658 is about 16017.1988187698. The cubic root of 256550658 is about 635.4153630235.

The spelling of 256550658 in words is "two hundred fifty-six million, five hundred fifty thousand, six hundred fifty-eight".