256824490 has 16 divisors (see below), whose sum is σ = 497844648. Its totient is φ = 94827456.

The previous prime is 256824473. The next prime is 256824499. The reversal of 256824490 is 94428652.

It can be written as a sum of positive squares in 4 ways, for example, as 102394161 + 154430329 = 10119^2 + 12427^2 .

It is not an unprimeable number, because it can be changed into a prime (256824499) 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, 987657 + ... + 987916.

Almost surely, 2^256824490 is an apocalyptic number.

256824490 is a deficient number, since it is larger than the sum of its proper divisors (241020158).

256824490 is a wasteful number, since it uses less digits than its factorization.

256824490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1975593.

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

The square root of 256824490 is about 16025.7446004858. The cubic root of 256824490 is about 635.6413550256.

The spelling of 256824490 in words is "two hundred fifty-six million, eight hundred twenty-four thousand, four hundred ninety".