68839517 has 4 divisors (see below), whose sum is σ = 70440480. Its totient is φ = 67238556.

The previous prime is 68839501. The next prime is 68839523. The reversal of 68839517 is 71593886.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68839517 - 2⁴ = 68839501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68839567) 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, 800417 + ... + 800502.

It is an arithmetic number, because the mean of its divisors is an integer number (17610120).

Almost surely, 2^68839517 is an apocalyptic number.

It is an amenable number.

68839517 is a deficient number, since it is larger than the sum of its proper divisors (1600963).

68839517 is a wasteful number, since it uses less digits than its factorization.

68839517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600962.

The product of its digits is 362880, while the sum is 47.

The square root of 68839517 is about 8296.9582980753. The cubic root of 68839517 is about 409.8383598401.

The spelling of 68839517 in words is "sixty-eight million, eight hundred thirty-nine thousand, five hundred seventeen".