256078389 has 16 divisors (see below), whose sum is σ = 407181312. Its totient is φ = 139968048.

The previous prime is 256078367. The next prime is 256078393. The reversal of 256078389 is 983870652.

It is not a de Polignac number, because 256078389 - 2⁷ = 256078261 is a prime.

It is a super-2 number, since 2×256078389² = 131152282625670642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256078309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264609 + ... + 265574.

It is an arithmetic number, because the mean of its divisors is an integer number (25448832).

Almost surely, 2^256078389 is an apocalyptic number.

It is an amenable number.

256078389 is a deficient number, since it is larger than the sum of its proper divisors (151102923).

256078389 is a wasteful number, since it uses less digits than its factorization.

256078389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530216.

The product of its (nonzero) digits is 725760, while the sum is 48.

The square root of 256078389 is about 16002.4494687532. The cubic root of 256078389 is about 635.0252239551.

The spelling of 256078389 in words is "two hundred fifty-six million, seventy-eight thousand, three hundred eighty-nine".