68686984 has 8 divisors (see below), whose sum is σ = 128788110. Its totient is φ = 34343488.

The previous prime is 68686973. The next prime is 68686991. The reversal of 68686984 is 48968686.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 51696100 + 16990884 = 7190^2 + 4122^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4292929 + ... + 4292944.

Almost surely, 2^68686984 is an apocalyptic number.

It is an amenable number.

68686984 is a deficient number, since it is larger than the sum of its proper divisors (60101126).

68686984 is a wasteful number, since it uses less digits than its factorization.

68686984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8585879 (or 8585875 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 55.

The square root of 68686984 is about 8287.7610969429. The cubic root of 68686984 is about 409.5354325562.

The spelling of 68686984 in words is "sixty-eight million, six hundred eighty-six thousand, nine hundred eighty-four".