68185990 has 16 divisors (see below), whose sum is σ = 122852448. Its totient is φ = 27248256.

The previous prime is 68185981. The next prime is 68185991. The reversal of 68185990 is 9958186.

It is a self number, because there is not a number n which added to its sum of digits gives 68185990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68185991) 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 7 ways as a sum of consecutive naturals, for example, 10414 + ... + 15646.

It is an arithmetic number, because the mean of its divisors is an integer number (7678278).

Almost surely, 2^68185990 is an apocalyptic number.

68185990 is a deficient number, since it is larger than the sum of its proper divisors (54666458).

68185990 is a wasteful number, since it uses less digits than its factorization.

68185990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6543.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 68185990 is about 8257.4808507195. The cubic root of 68185990 is about 408.5373023270.

The spelling of 68185990 in words is "sixty-eight million, one hundred eighty-five thousand, nine hundred ninety".