68971816 has 8 divisors (see below), whose sum is σ = 129322170. Its totient is φ = 34485904.

The previous prime is 68971781. The next prime is 68971841. The reversal of 68971816 is 61817986.

It can be written as a sum of positive squares in only one way, i.e., 39312900 + 29658916 = 6270^2 + 5446^2 .

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

It is a super-2 number, since 2×68971816² = 9514222804675712, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4310731 + ... + 4310746.

Almost surely, 2^68971816 is an apocalyptic number.

It is an amenable number.

68971816 is a deficient number, since it is larger than the sum of its proper divisors (60350354).

68971816 is a wasteful number, since it uses less digits than its factorization.

68971816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8621483 (or 8621479 counting only the distinct ones).

The product of its digits is 145152, while the sum is 46.

The square root of 68971816 is about 8304.9272122036. The cubic root of 68971816 is about 410.1007406625.

The spelling of 68971816 in words is "sixty-eight million, nine hundred seventy-one thousand, eight hundred sixteen".