68517928 has 8 divisors (see below), whose sum is σ = 128471130. Its totient is φ = 34258960.

The previous prime is 68517919. The next prime is 68517931. The reversal of 68517928 is 82971586.

It can be written as a sum of positive squares in only one way, i.e., 64032004 + 4485924 = 8002^2 + 2118^2 .

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, 4282363 + ... + 4282378.

Almost surely, 2^68517928 is an apocalyptic number.

It is an amenable number.

68517928 is a deficient number, since it is larger than the sum of its proper divisors (59953202).

68517928 is a wasteful number, since it uses less digits than its factorization.

68517928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8564747 (or 8564743 counting only the distinct ones).

The product of its digits is 241920, while the sum is 46.

The square root of 68517928 is about 8277.5556778556. Note that the first 3 decimals coincide. The cubic root of 68517928 is about 409.1991665129.

The spelling of 68517928 in words is "sixty-eight million, five hundred seventeen thousand, nine hundred twenty-eight".