68651009 has 18 divisors (see below), whose sum is σ = 84305394. Its totient is φ = 55732320.

The previous prime is 68650999. The next prime is 68651027. The reversal of 68651009 is 90015686.

It can be written as a sum of positive squares in only one way, i.e., 61575409 + 7075600 = 7847^2 + 2660^2 .

It is a de Polignac number, because none of the positive numbers 2^k-68651009 is a prime.

It is a super-2 number, since 2×68651009² = 9425922073436162, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68651009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68651029) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 15749 + ... + 19629.

It is an arithmetic number, because the mean of its divisors is an integer number (4683633).

Almost surely, 2^68651009 is an apocalyptic number.

It is an amenable number.

68651009 is a deficient number, since it is larger than the sum of its proper divisors (15654385).

68651009 is a wasteful number, since it uses less digits than its factorization.

68651009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3933 (or 3907 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 68651009 is about 8285.5904436558. The cubic root of 68651009 is about 409.4639216273.

The spelling of 68651009 in words is "sixty-eight million, six hundred fifty-one thousand, nine".