290256681 has 16 divisors (see below), whose sum is σ = 454668480. Its totient is φ = 162381120.

The previous prime is 290256677. The next prime is 290256683. The reversal of 290256681 is 186652092.

It is not a de Polignac number, because 290256681 - 2² = 290256677 is a prime.

It is a super-2 number, since 2×290256681² = 168497881730271522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (290256683) 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, 337866 + ... + 338723.

It is an arithmetic number, because the mean of its divisors is an integer number (28416780).

Almost surely, 2^290256681 is an apocalyptic number.

It is an amenable number.

290256681 is a deficient number, since it is larger than the sum of its proper divisors (164411799).

290256681 is a wasteful number, since it uses less digits than its factorization.

290256681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676616.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 290256681 is about 17036.9211126893. The cubic root of 290256681 is about 662.1058244250.

The spelling of 290256681 in words is "two hundred ninety million, two hundred fifty-six thousand, six hundred eighty-one".