845990681 has 8 divisors (see below), whose sum is σ = 869292864. Its totient is φ = 822711600.

The previous prime is 845990671. The next prime is 845990711. The reversal of 845990681 is 186099548.

It is a happy number.

845990681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 845990681 - 2⁶ = 845990617 is a prime.

It is a super-2 number, since 2×845990681² = 1431400464677687522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (845990671) 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, 89906 + ... + 98868.

It is an arithmetic number, because the mean of its divisors is an integer number (108661608).

Almost surely, 2^845990681 is an apocalyptic number.

It is an amenable number.

845990681 is a deficient number, since it is larger than the sum of its proper divisors (23302183).

845990681 is a wasteful number, since it uses less digits than its factorization.

845990681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11551.

The product of its (nonzero) digits is 622080, while the sum is 50.

The square root of 845990681 is about 29085.9189471469. The cubic root of 845990681 is about 945.7765165549.

The spelling of 845990681 in words is "eight hundred forty-five million, nine hundred ninety thousand, six hundred eighty-one".