68639217 has 16 divisors (see below), whose sum is σ = 97070400. Its totient is φ = 42993152.

The previous prime is 68639209. The next prime is 68639227. The reversal of 68639217 is 71293686.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 68639217 - 2³ = 68639209 is a prime.

It is a super-2 number, since 2×68639217² = 9422684220746178, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68639227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52858 + ... + 54140.

It is an arithmetic number, because the mean of its divisors is an integer number (6066900).

Almost surely, 2^68639217 is an apocalyptic number.

It is an amenable number.

68639217 is a deficient number, since it is larger than the sum of its proper divisors (28431183).

68639217 is a wasteful number, since it uses less digits than its factorization.

68639217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2352.

The product of its digits is 108864, while the sum is 42.

The square root of 68639217 is about 8284.8788162531. The cubic root of 68639217 is about 409.4404761110.

It can be divided in two parts, 686 and 39217, that added together give a triangular number (39903 = T₂₈₂).

The spelling of 68639217 in words is "sixty-eight million, six hundred thirty-nine thousand, two hundred seventeen".