256278305 has 8 divisors (see below), whose sum is σ = 320905152. Its totient is φ = 196108528.

The previous prime is 256278299. The next prime is 256278311. The reversal of 256278305 is 503872652.

It is an interprime number because it is at equal distance from previous prime (256278299) and next prime (256278311).

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 256278305 - 2¹² = 256274209 is a prime.

It is a super-2 number, since 2×256278305² = 131357139227346050, which contains 22 as substring.

It is a Duffinian 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, 1114139 + ... + 1114368.

It is an arithmetic number, because the mean of its divisors is an integer number (40113144).

Almost surely, 2^256278305 is an apocalyptic number.

It is an amenable number.

256278305 is a deficient number, since it is larger than the sum of its proper divisors (64626847).

256278305 is a wasteful number, since it uses less digits than its factorization.

256278305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2228535.

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 256278305 is about 16008.6946688354. The cubic root of 256278305 is about 635.1904320660.

The spelling of 256278305 in words is "two hundred fifty-six million, two hundred seventy-eight thousand, three hundred five".