68749997 has 4 divisors (see below), whose sum is σ = 68785116. Its totient is φ = 68714880.

The previous prime is 68749969. The next prime is 68750021. The reversal of 68749997 is 79994786.

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 8128201 + 60621796 = 2851^2 + 7786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68749997 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 (68749097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14438 + ... + 18599.

It is an arithmetic number, because the mean of its divisors is an integer number (17196279).

Almost surely, 2^68749997 is an apocalyptic number.

It is an amenable number.

68749997 is a deficient number, since it is larger than the sum of its proper divisors (35119).

68749997 is a wasteful number, since it uses less digits than its factorization.

68749997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35118.

The product of its digits is 6858432, while the sum is 59.

The square root of 68749997 is about 8291.5617949817. The cubic root of 68749997 is about 409.6606293416.

The spelling of 68749997 in words is "sixty-eight million, seven hundred forty-nine thousand, nine hundred ninety-seven".