68688733 has 4 divisors (see below), whose sum is σ = 71057340. Its totient is φ = 66320128.

The previous prime is 68688709. The next prime is 68688769. The reversal of 68688733 is 33788686.

It is a happy number.

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 21930489 + 46758244 = 4683^2 + 6838^2 .

It is a cyclic number.

It is not a de Polignac number, because 68688733 - 2¹³ = 68680541 is a prime.

It is a super-2 number, since 2×68688733² = 9436284082290578, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68688703) 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, 1184260 + ... + 1184317.

It is an arithmetic number, because the mean of its divisors is an integer number (17764335).

Almost surely, 2^68688733 is an apocalyptic number.

It is an amenable number.

68688733 is a deficient number, since it is larger than the sum of its proper divisors (2368607).

68688733 is a wasteful number, since it uses less digits than its factorization.

68688733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2368606.

The product of its digits is 1161216, while the sum is 49.

The square root of 68688733 is about 8287.8666133089. The cubic root of 68688733 is about 409.5389085733.

The spelling of 68688733 in words is "sixty-eight million, six hundred eighty-eight thousand, seven hundred thirty-three".