68563865 has 8 divisors (see below), whose sum is σ = 82322568. Its totient is φ = 54820480.

The previous prime is 68563861. The next prime is 68563877. The reversal of 68563865 is 56836586.

It can be written as a sum of positive squares in 4 ways, for example, as 19044496 + 49519369 = 4364^2 + 7037^2 .

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

It is not a de Polignac number, because 68563865 - 2² = 68563861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68563861) 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, 11909 + ... + 16701.

It is an arithmetic number, because the mean of its divisors is an integer number (10290321).

Almost surely, 2^68563865 is an apocalyptic number.

It is an amenable number.

68563865 is a deficient number, since it is larger than the sum of its proper divisors (13758703).

68563865 is a wasteful number, since it uses less digits than its factorization.

68563865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7659.

The product of its digits is 1036800, while the sum is 47.

The square root of 68563865 is about 8280.3300055010. The cubic root of 68563865 is about 409.2905935958.

The spelling of 68563865 in words is "sixty-eight million, five hundred sixty-three thousand, eight hundred sixty-five".