256204240 has 40 divisors (see below), whose sum is σ = 596647080. Its totient is φ = 102314496.

The previous prime is 256204217. The next prime is 256204253. The reversal of 256204240 is 42402652.

It can be written as a sum of positive squares in 4 ways, for example, as 15085456 + 241118784 = 3884^2 + 15528^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×256204240² = 131281225187955200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54462 + ... + 58978.

It is an arithmetic number, because the mean of its divisors is an integer number (14916177).

Almost surely, 2^256204240 is an apocalyptic number.

256204240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256204240 is an abundant number, since it is smaller than the sum of its proper divisors (340442840).

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

256204240 is a wasteful number, since it uses less digits than its factorization.

256204240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5239 (or 5233 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 256204240 is about 16006.3812274980. The cubic root of 256204240 is about 635.1292356879.

Adding to 256204240 its reverse (42402652), we get a palindrome (298606892).

The spelling of 256204240 in words is "two hundred fifty-six million, two hundred four thousand, two hundred forty".