256650426 has 72 divisors (see below), whose sum is σ = 591593652. Its totient is φ = 80352000.

The previous prime is 256650403. The next prime is 256650431. The reversal of 256650426 is 624056652.

256650426 is a `hidden beast` number, since 2 + 566 + 50 + 42 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 181845225 + 74805201 = 13485^2 + 8649^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 639826 + ... + 640226.

Almost surely, 2^256650426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256650426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295796826).

256650426 is an abundant number, since it is smaller than the sum of its proper divisors (334943226).

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

256650426 is a wasteful number, since it uses less digits than its factorization.

256650426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508 (or 474 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 256650426 is about 16020.3129182922. The cubic root of 256650426 is about 635.4977196032.

The spelling of 256650426 in words is "two hundred fifty-six million, six hundred fifty thousand, four hundred twenty-six".