256880490 has 16 divisors (see below), whose sum is σ = 616513248. Its totient is φ = 68501456.

The previous prime is 256880483. The next prime is 256880497. The reversal of 256880490 is 94088652.

It is an interprime number because it is at equal distance from previous prime (256880483) and next prime (256880497).

It is a super-2 number, since 2×256880490² = 131975172285280200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (256880497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4281312 + ... + 4281371.

It is an arithmetic number, because the mean of its divisors is an integer number (38532078).

Almost surely, 2^256880490 is an apocalyptic number.

256880490 is an abundant number, since it is smaller than the sum of its proper divisors (359632758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256880490 is a wasteful number, since it uses less digits than its factorization.

256880490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8562693.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 256880490 is about 16027.4916939613. The cubic root of 256880490 is about 635.6875517220.

The spelling of 256880490 in words is "two hundred fifty-six million, eight hundred eighty thousand, four hundred ninety".