256607645 has 8 divisors (see below), whose sum is σ = 351919104. Its totient is φ = 175959504.

The previous prime is 256607633. The next prime is 256607693. The reversal of 256607645 is 546706652.

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

It is not a de Polignac number, because 256607645 - 2⁶ = 256607581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3665789 + ... + 3665858.

It is an arithmetic number, because the mean of its divisors is an integer number (43989888).

Almost surely, 2^256607645 is an apocalyptic number.

It is an amenable number.

256607645 is a deficient number, since it is larger than the sum of its proper divisors (95311459).

256607645 is an equidigital number, since it uses as much as digits as its factorization.

256607645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7331659.

The product of its (nonzero) digits is 302400, while the sum is 41.

The square root of 256607645 is about 16018.9776515232. The cubic root of 256607645 is about 635.4624073185.

The spelling of 256607645 in words is "two hundred fifty-six million, six hundred seven thousand, six hundred forty-five".