247740256 has 24 divisors (see below), whose sum is σ = 491256360. Its totient is φ = 122976768.

The previous prime is 247740253. The next prime is 247740343. The reversal of 247740256 is 652047742.

It is a super-2 number, since 2×247740256² = 122750468885891072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247740253) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 23401 + ... + 32296.

It is an arithmetic number, because the mean of its divisors is an integer number (20469015).

Almost surely, 2^247740256 is an apocalyptic number.

It is an amenable number.

247740256 is a deficient number, since it is larger than the sum of its proper divisors (243516104).

247740256 is a wasteful number, since it uses less digits than its factorization.

247740256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55846 (or 55838 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 37.

The square root of 247740256 is about 15739.7667072927. The cubic root of 247740256 is about 628.0567111754.

Adding to 247740256 its reverse (652047742), we get a palindrome (899787998).

The spelling of 247740256 in words is "two hundred forty-seven million, seven hundred forty thousand, two hundred fifty-six".