256750369 has 8 divisors (see below), whose sum is σ = 266198760. Its totient is φ = 247341696.

The previous prime is 256750349. The next prime is 256750379. The reversal of 256750369 is 963057652.

It can be written as a sum of positive squares in 4 ways, for example, as 58982400 + 197767969 = 7680^2 + 14063^2 .

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

It is not a de Polignac number, because 256750369 - 2¹⁹ = 256226081 is a prime.

It is a super-2 number, since 2×256750369² = 131841503963272322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256750349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3567 + ... + 22939.

It is an arithmetic number, because the mean of its divisors is an integer number (33274845).

Almost surely, 2^256750369 is an apocalyptic number.

256750369 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

256750369 is a deficient number, since it is larger than the sum of its proper divisors (9448391).

256750369 is a wasteful number, since it uses less digits than its factorization.

256750369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19859.

The product of its (nonzero) digits is 340200, while the sum is 43.

The square root of 256750369 is about 16023.4318733535. The cubic root of 256750369 is about 635.5801992455.

The spelling of 256750369 in words is "two hundred fifty-six million, seven hundred fifty thousand, three hundred sixty-nine".