256715485 has 8 divisors (see below), whose sum is σ = 331755480. Its totient is φ = 189574464.

The previous prime is 256715467. The next prime is 256715491. The reversal of 256715485 is 584517652.

It can be written as a sum of positive squares in 4 ways, for example, as 32285124 + 224430361 = 5682^2 + 14981^2 .

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 256715485 - 2¹⁷ = 256584413 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1974670 + ... + 1974799.

It is an arithmetic number, because the mean of its divisors is an integer number (41469435).

Almost surely, 2^256715485 is an apocalyptic number.

It is an amenable number.

256715485 is a deficient number, since it is larger than the sum of its proper divisors (75039995).

256715485 is a wasteful number, since it uses less digits than its factorization.

256715485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3949487.

The product of its digits is 336000, while the sum is 43.

The square root of 256715485 is about 16022.3433055218. The cubic root of 256715485 is about 635.5514130696.

The spelling of 256715485 in words is "two hundred fifty-six million, seven hundred fifteen thousand, four hundred eighty-five".