68978984 has 8 divisors (see below), whose sum is σ = 129335610. Its totient is φ = 34489488.

The previous prime is 68978977. The next prime is 68979007. The reversal of 68978984 is 48987986.

It can be written as a sum of positive squares in only one way, i.e., 65254084 + 3724900 = 8078^2 + 1930^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4311179 + ... + 4311194.

Almost surely, 2^68978984 is an apocalyptic number.

It is an amenable number.

68978984 is a deficient number, since it is larger than the sum of its proper divisors (60356626).

68978984 is a wasteful number, since it uses less digits than its factorization.

68978984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8622379 (or 8622375 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 59.

The square root of 68978984 is about 8305.3587520347. The cubic root of 68978984 is about 410.1149469497.

The spelling of 68978984 in words is "sixty-eight million, nine hundred seventy-eight thousand, nine hundred eighty-four".