68591817 has 18 divisors (see below), whose sum is σ = 115253658. Its totient is φ = 39195072.

The previous prime is 68591813. The next prime is 68591833. The reversal of 68591817 is 71819586.

It can be written as a sum of positive squares in only one way, i.e., 62346816 + 6245001 = 7896^2 + 2499^2 .

It is not a de Polignac number, because 68591817 - 2² = 68591813 is a prime.

It is a super-2 number, since 2×68591817² = 9409674718722978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68591813) 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, 77328 + ... + 78209.

It is an arithmetic number, because the mean of its divisors is an integer number (6402981).

Almost surely, 2^68591817 is an apocalyptic number.

It is an amenable number.

68591817 is a deficient number, since it is larger than the sum of its proper divisors (46661841).

68591817 is a wasteful number, since it uses less digits than its factorization.

68591817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155557 (or 155547 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 68591817 is about 8282.0176889451. The cubic root of 68591817 is about 409.3462056705.

The spelling of 68591817 in words is "sixty-eight million, five hundred ninety-one thousand, eight hundred seventeen".