256435320 has 64 divisors (see below), whose sum is σ = 788084640. Its totient is φ = 66713600.

The previous prime is 256435247. The next prime is 256435321. The reversal of 256435320 is 23534652.

256435320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256435321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21141 + ... + 30980.

Almost surely, 2^256435320 is an apocalyptic number.

256435320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256435320 is an abundant number, since it is smaller than the sum of its proper divisors (531649320).

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

256435320 is a wasteful number, since it uses less digits than its factorization.

256435320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52176 (or 52172 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 30.

The square root of 256435320 is about 16013.5979717239. The cubic root of 256435320 is about 635.3201270922.

Adding to 256435320 its reverse (23534652), we get a palindrome (279969972).

The spelling of 256435320 in words is "two hundred fifty-six million, four hundred thirty-five thousand, three hundred twenty".