68520517 has 8 divisors (see below), whose sum is σ = 77675360. Its totient is φ = 59920560.

The previous prime is 68520503. The next prime is 68520539. The reversal of 68520517 is 71502586.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68520517 is a prime.

It is a super-2 number, since 2×68520517² = 9390122499894578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68520577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138459 + ... + 138952.

It is an arithmetic number, because the mean of its divisors is an integer number (9709420).

Almost surely, 2^68520517 is an apocalyptic number.

It is an amenable number.

68520517 is a deficient number, since it is larger than the sum of its proper divisors (9154843).

68520517 is a wasteful number, since it uses less digits than its factorization.

68520517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277443.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 68520517 is about 8277.7120631247. The cubic root of 68520517 is about 409.2043204112.

The spelling of 68520517 in words is "sixty-eight million, five hundred twenty thousand, five hundred seventeen".