256437065 has 8 divisors (see below), whose sum is σ = 308018760. Its totient is φ = 204953472.

The previous prime is 256437037. The next prime is 256437119. The reversal of 256437065 is 560734652.

It can be written as a sum of positive squares in 4 ways, for example, as 101384761 + 155052304 = 10069^2 + 12452^2 .

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 256437065 - 2¹⁶ = 256371529 is a prime.

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, 18644 + ... + 29333.

It is an arithmetic number, because the mean of its divisors is an integer number (38502345).

Almost surely, 2^256437065 is an apocalyptic number.

It is an amenable number.

256437065 is a deficient number, since it is larger than the sum of its proper divisors (51581695).

256437065 is a wasteful number, since it uses less digits than its factorization.

256437065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49051.

The product of its (nonzero) digits is 151200, while the sum is 38.

The square root of 256437065 is about 16013.6524565759. The cubic root of 256437065 is about 635.3215681717.

The spelling of 256437065 in words is "two hundred fifty-six million, four hundred thirty-seven thousand, sixty-five".