68657971 has 4 divisors (see below), whose sum is σ = 70254712. Its totient is φ = 67061232.

The previous prime is 68657969. The next prime is 68657983. The reversal of 68657971 is 17975686.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68657971 - 2¹ = 68657969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68657371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 798306 + ... + 798391.

It is an arithmetic number, because the mean of its divisors is an integer number (17563678).

Almost surely, 2^68657971 is an apocalyptic number.

68657971 is a deficient number, since it is larger than the sum of its proper divisors (1596741).

68657971 is a wasteful number, since it uses less digits than its factorization.

68657971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596740.

The product of its digits is 635040, while the sum is 49.

The square root of 68657971 is about 8286.0105599740. The cubic root of 68657971 is about 409.4777626060.

The spelling of 68657971 in words is "sixty-eight million, six hundred fifty-seven thousand, nine hundred seventy-one".