256145646 has 8 divisors (see below), whose sum is σ = 512291304. Its totient is φ = 85381880.

The previous prime is 256145639. The next prime is 256145683. The reversal of 256145646 is 646541652.

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

256145646 is an admirable number.

It is a super-2 number, since 2×256145646² = 131221183929514632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21345465 + ... + 21345476.

It is an arithmetic number, because the mean of its divisors is an integer number (64036413).

Almost surely, 2^256145646 is an apocalyptic number.

256145646 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256145646 is a wasteful number, since it uses less digits than its factorization.

256145646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42690946.

The product of its digits is 172800, while the sum is 39.

The square root of 256145646 is about 16004.5507903221. The cubic root of 256145646 is about 635.0808139030.

The spelling of 256145646 in words is "two hundred fifty-six million, one hundred forty-five thousand, six hundred forty-six".