68929997 has 4 divisors (see below), whose sum is σ = 69098940. Its totient is φ = 68761056.

The previous prime is 68929981. The next prime is 68929999. The reversal of 68929997 is 79992986.

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

It can be written as a sum of positive squares in 2 ways, for example, as 36735721 + 32194276 = 6061^2 + 5674^2 .

It is a cyclic number.

It is not a de Polignac number, because 68929997 - 2⁴ = 68929981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68929999) 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, 83858 + ... + 84675.

It is an arithmetic number, because the mean of its divisors is an integer number (17274735).

Almost surely, 2^68929997 is an apocalyptic number.

It is an amenable number.

68929997 is a deficient number, since it is larger than the sum of its proper divisors (168943).

68929997 is a wasteful number, since it uses less digits than its factorization.

68929997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168942.

The product of its digits is 4408992, while the sum is 59.

The square root of 68929997 is about 8302.4091082047. The cubic root of 68929997 is about 410.0178397948.

The spelling of 68929997 in words is "sixty-eight million, nine hundred twenty-nine thousand, nine hundred ninety-seven".