256623982 has 4 divisors (see below), whose sum is σ = 384935976. Its totient is φ = 128311990.

The previous prime is 256623979. The next prime is 256624001. The reversal of 256623982 is 289326652.

It is a happy number.

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

It is a congruent number.

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 as a sum of consecutive naturals, namely, 64155994 + ... + 64155997.

It is an arithmetic number, because the mean of its divisors is an integer number (96233994).

Almost surely, 2^256623982 is an apocalyptic number.

256623982 is a deficient number, since it is larger than the sum of its proper divisors (128311994).

256623982 is a wasteful number, since it uses less digits than its factorization.

256623982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128311993.

The product of its digits is 311040, while the sum is 43.

The square root of 256623982 is about 16019.4875698319. The cubic root of 256623982 is about 635.4758926650.

The spelling of 256623982 in words is "two hundred fifty-six million, six hundred twenty-three thousand, nine hundred eighty-two".