256212890 has 16 divisors (see below), whose sum is σ = 465939432. Its totient is φ = 101428224.

The previous prime is 256212889. The next prime is 256212907. The reversal of 256212890 is 98212652.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 188265841 + 67947049 = 13721^2 + 8243^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 256212890.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131099 + ... + 133038.

Almost surely, 2^256212890 is an apocalyptic number.

256212890 is a deficient number, since it is larger than the sum of its proper divisors (209726542).

256212890 is a wasteful number, since it uses less digits than its factorization.

256212890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264241.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 256212890 is about 16006.6514299525. The cubic root of 256212890 is about 635.1363833787.

The spelling of 256212890 in words is "two hundred fifty-six million, two hundred twelve thousand, eight hundred ninety".