68729951 has 4 divisors (see below), whose sum is σ = 69079032. Its totient is φ = 68380872.

The previous prime is 68729939. The next prime is 68729977. The reversal of 68729951 is 15992786.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68729951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68729896 and 68729905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68729851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174245 + ... + 174638.

It is an arithmetic number, because the mean of its divisors is an integer number (17269758).

Almost surely, 2^68729951 is an apocalyptic number.

68729951 is a deficient number, since it is larger than the sum of its proper divisors (349081).

68729951 is a wasteful number, since it uses less digits than its factorization.

68729951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349080.

The product of its digits is 272160, while the sum is 47.

The square root of 68729951 is about 8290.3528875434. The cubic root of 68729951 is about 409.6208094356.

The spelling of 68729951 in words is "sixty-eight million, seven hundred twenty-nine thousand, nine hundred fifty-one".