256620242 has 8 divisors (see below), whose sum is σ = 387155916. Its totient is φ = 127568272.

The previous prime is 256620239. The next prime is 256620281. The reversal of 256620242 is 242026652.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 256608361 + 11881 = 16019^2 + 109^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 370493 + ... + 371184.

Almost surely, 2^256620242 is an apocalyptic number.

256620242 is a deficient number, since it is larger than the sum of its proper divisors (130535674).

256620242 is a wasteful number, since it uses less digits than its factorization.

256620242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741852.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 256620242 is about 16019.3708365841. The cubic root of 256620242 is about 635.4728055394.

Adding to 256620242 its reverse (242026652), we get a palindrome (498646894).

The spelling of 256620242 in words is "two hundred fifty-six million, six hundred twenty thousand, two hundred forty-two".