256730481 has 24 divisors (see below), whose sum is σ = 448740864. Its totient is φ = 138072960.

The previous prime is 256730477. The next prime is 256730483. The reversal of 256730481 is 184037652.

It is not a de Polignac number, because 256730481 - 2² = 256730477 is a prime.

It is a super-2 number, since 2×256730481² = 131821079748982722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256730483) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118785 + ... + 120926.

It is an arithmetic number, because the mean of its divisors is an integer number (18697536).

Almost surely, 2^256730481 is an apocalyptic number.

256730481 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

256730481 is a deficient number, since it is larger than the sum of its proper divisors (192010383).

256730481 is a wasteful number, since it uses less digits than its factorization.

256730481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239741 (or 239738 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 256730481 is about 16022.8112701860. The cubic root of 256730481 is about 635.5637880450.

The spelling of 256730481 in words is "two hundred fifty-six million, seven hundred thirty thousand, four hundred eighty-one".