256454646 has 64 divisors (see below), whose sum is σ = 614642688. Its totient is φ = 69746688.

The previous prime is 256454629. The next prime is 256454677. The reversal of 256454646 is 646454652.

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

It is a junction number, because it is equal to n+sod(n) for n = 256454598 and 256454607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 247746 + ... + 248778.

It is an arithmetic number, because the mean of its divisors is an integer number (9603792).

Almost surely, 2^256454646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256454646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307321344).

256454646 is an abundant number, since it is smaller than the sum of its proper divisors (358188042).

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

256454646 is a wasteful number, since it uses less digits than its factorization.

256454646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325.

The product of its digits is 691200, while the sum is 42.

The square root of 256454646 is about 16014.2013850207. The cubic root of 256454646 is about 635.3360867870.

The spelling of 256454646 in words is "two hundred fifty-six million, four hundred fifty-four thousand, six hundred forty-six".