256672307 has 8 divisors (see below), whose sum is σ = 275494896. Its totient is φ = 238263552.

The previous prime is 256672303. The next prime is 256672309. The reversal of 256672307 is 703276652.

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

It is a cyclic number.

It is not a de Polignac number, because 256672307 - 2² = 256672303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256672303) 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 7 ways as a sum of consecutive naturals, for example, 102173 + ... + 104654.

It is an arithmetic number, because the mean of its divisors is an integer number (34436862).

Almost surely, 2^256672307 is an apocalyptic number.

256672307 is a deficient number, since it is larger than the sum of its proper divisors (18822589).

256672307 is a wasteful number, since it uses less digits than its factorization.

256672307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206917.

The product of its (nonzero) digits is 105840, while the sum is 38.

The square root of 256672307 is about 16020.9958179883. The cubic root of 256672307 is about 635.5157790971.

The spelling of 256672307 in words is "two hundred fifty-six million, six hundred seventy-two thousand, three hundred seven".