68520569 has 8 divisors (see below), whose sum is σ = 74082120. Its totient is φ = 63000576.

The previous prime is 68520563. The next prime is 68520577. The reversal of 68520569 is 96502586.

It can be written as a sum of positive squares in 4 ways, for example, as 8922169 + 59598400 = 2987^2 + 7720^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 68520569 - 2²⁰ = 67471993 is a prime.

It is a super-2 number, since 2×68520569² = 9390136752167522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68520563) 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, 6914 + ... + 13595.

It is an arithmetic number, because the mean of its divisors is an integer number (9260265).

Almost surely, 2^68520569 is an apocalyptic number.

It is an amenable number.

68520569 is a deficient number, since it is larger than the sum of its proper divisors (5561551).

68520569 is a wasteful number, since it uses less digits than its factorization.

68520569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20779.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 68520569 is about 8277.7152040886. The cubic root of 68520569 is about 409.2044239258.

The spelling of 68520569 in words is "sixty-eight million, five hundred twenty thousand, five hundred sixty-nine".