68917645 has 4 divisors (see below), whose sum is σ = 82701180. Its totient is φ = 55134112.

The previous prime is 68917633. The next prime is 68917657. The reversal of 68917645 is 54671986.

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

It is an interprime number because it is at equal distance from previous prime (68917633) and next prime (68917657).

It can be written as a sum of positive squares in 2 ways, for example, as 47858724 + 21058921 = 6918^2 + 4589^2 .

It is a cyclic number.

It is not a de Polignac number, because 68917645 - 2⁷ = 68917517 is a prime.

It is a super-3 number, since 3×68917645³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 68917595 and 68917604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6891760 + ... + 6891769.

It is an arithmetic number, because the mean of its divisors is an integer number (20675295).

Almost surely, 2^68917645 is an apocalyptic number.

It is an amenable number.

68917645 is a deficient number, since it is larger than the sum of its proper divisors (13783535).

68917645 is a wasteful number, since it uses less digits than its factorization.

68917645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13783534.

The product of its digits is 362880, while the sum is 46.

The square root of 68917645 is about 8301.6651944053. The cubic root of 68917645 is about 409.9933471060.

The spelling of 68917645 in words is "sixty-eight million, nine hundred seventeen thousand, six hundred forty-five".