68664751 has 8 divisors (see below), whose sum is σ = 73072800. Its totient is φ = 64297728.

The previous prime is 68664719. The next prime is 68664767. The reversal of 68664751 is 15746686.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68664751 - 2⁵ = 68664719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68664698 and 68664707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68664781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6766 + ... + 13531.

It is an arithmetic number, because the mean of its divisors is an integer number (9134100).

Almost surely, 2^68664751 is an apocalyptic number.

68664751 is the 6766-th pentagonal number.

68664751 is a deficient number, since it is larger than the sum of its proper divisors (4408049).

68664751 is a wasteful number, since it uses less digits than its factorization.

68664751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20513.

The product of its digits is 241920, while the sum is 43.

The square root of 68664751 is about 8286.4196731761. The cubic root of 68664751 is about 409.4912408558.

The spelling of 68664751 in words is "sixty-eight million, six hundred sixty-four thousand, seven hundred fifty-one".