256542346 has 4 divisors (see below), whose sum is σ = 384813522. Its totient is φ = 128271172.

The previous prime is 256542337. The next prime is 256542379. The reversal of 256542346 is 643245652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 255520225 + 1022121 = 15985^2 + 1011^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64135585 + ... + 64135588.

Almost surely, 2^256542346 is an apocalyptic number.

256542346 is a deficient number, since it is larger than the sum of its proper divisors (128271176).

256542346 is a wasteful number, since it uses less digits than its factorization.

256542346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128271175.

The product of its digits is 172800, while the sum is 37.

The square root of 256542346 is about 16016.9393455804. The cubic root of 256542346 is about 635.4085006627.

Adding to 256542346 its reverse (643245652), we get a palindrome (899787998).

The spelling of 256542346 in words is "two hundred fifty-six million, five hundred forty-two thousand, three hundred forty-six".