256721674 has 8 divisors (see below), whose sum is σ = 420090048. Its totient is φ = 116691660.

The previous prime is 256721671. The next prime is 256721677. The reversal of 256721674 is 476127652.

It is an interprime number because it is at equal distance from previous prime (256721671) and next prime (256721677).

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

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (256721671) 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, 5834562 + ... + 5834605.

It is an arithmetic number, because the mean of its divisors is an integer number (52511256).

Almost surely, 2^256721674 is an apocalyptic number.

256721674 is a deficient number, since it is larger than the sum of its proper divisors (163368374).

256721674 is a wasteful number, since it uses less digits than its factorization.

256721674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11669180.

The product of its digits is 141120, while the sum is 40.

The square root of 256721674 is about 16022.5364409010. The cubic root of 256721674 is about 635.5565204048.

The spelling of 256721674 in words is "two hundred fifty-six million, seven hundred twenty-one thousand, six hundred seventy-four".