68019986 has 8 divisors (see below), whose sum is σ = 104787660. Its totient is φ = 33090768.

The previous prime is 68019961. The next prime is 68020031. The reversal of 68019986 is 68991086.

It can be written as a sum of positive squares in 2 ways, for example, as 58905625 + 9114361 = 7675^2 + 3019^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 68019986.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 459521 + ... + 459668.

Almost surely, 2^68019986 is an apocalyptic number.

68019986 is a deficient number, since it is larger than the sum of its proper divisors (36767674).

68019986 is a wasteful number, since it uses less digits than its factorization.

68019986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919228.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 68019986 is about 8247.4229914562. The cubic root of 68019986 is about 408.2054944898.

The spelling of 68019986 in words is "sixty-eight million, nineteen thousand, nine hundred eighty-six".