256490284 has 12 divisors (see below), whose sum is σ = 448988904. Its totient is φ = 128207744.

The previous prime is 256490281. The next prime is 256490303. The reversal of 256490284 is 482094652.

It is not an unprimeable number, because it can be changed into a prime (256490281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11004 + ... + 25180.

It is an arithmetic number, because the mean of its divisors is an integer number (37415742).

Almost surely, 2^256490284 is an apocalyptic number.

It is an amenable number.

256490284 is a deficient number, since it is larger than the sum of its proper divisors (192498620).

256490284 is a wasteful number, since it uses less digits than its factorization.

256490284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18704 (or 18702 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 256490284 is about 16015.3140462496. The cubic root of 256490284 is about 635.3655150687.

The spelling of 256490284 in words is "two hundred fifty-six million, four hundred ninety thousand, two hundred eighty-four".