68987717 has 4 divisors (see below), whose sum is σ = 73045836. Its totient is φ = 64929600.

The previous prime is 68987713. The next prime is 68987719. The reversal of 68987717 is 71778986.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71778986 = 2 ⋅35889493.

It can be written as a sum of positive squares in 2 ways, for example, as 40780996 + 28206721 = 6386^2 + 5311^2 .

It is a cyclic number.

It is not a de Polignac number, because 68987717 - 2² = 68987713 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 (68987713) 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, 2029034 + ... + 2029067.

It is an arithmetic number, because the mean of its divisors is an integer number (18261459).

Almost surely, 2^68987717 is an apocalyptic number.

It is an amenable number.

68987717 is a deficient number, since it is larger than the sum of its proper divisors (4058119).

68987717 is a wasteful number, since it uses less digits than its factorization.

68987717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4058118.

The product of its digits is 1185408, while the sum is 53.

The square root of 68987717 is about 8305.8844802947. The cubic root of 68987717 is about 410.1322535866.

The spelling of 68987717 in words is "sixty-eight million, nine hundred eighty-seven thousand, seven hundred seventeen".