68490844 has 12 divisors (see below), whose sum is σ = 122409504. Its totient is φ = 33516704.

The previous prime is 68490823. The next prime is 68490847. The reversal of 68490844 is 44809486.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 68490844.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68490847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181969 + ... + 182344.

It is an arithmetic number, because the mean of its divisors is an integer number (10200792).

Almost surely, 2^68490844 is an apocalyptic number.

It is an amenable number.

68490844 is a deficient number, since it is larger than the sum of its proper divisors (53918660).

68490844 is a wasteful number, since it uses less digits than its factorization.

68490844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364364 (or 364362 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 68490844 is about 8275.9195259500. The cubic root of 68490844 is about 409.1452428604.

The spelling of 68490844 in words is "sixty-eight million, four hundred ninety thousand, eight hundred forty-four".