65687879 has 2 divisors, whose sum is σ = 65687880. Its totient is φ = 65687878.

The previous prime is 65687849. The next prime is 65687891. The reversal of 65687879 is 97878656.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65687879 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65687849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32843939 + 32843940.

It is an arithmetic number, because the mean of its divisors is an integer number (32843940).

Almost surely, 2^65687879 is an apocalyptic number.

65687879 is a deficient number, since it is larger than the sum of its proper divisors (1).

65687879 is an equidigital number, since it uses as much as digits as its factorization.

65687879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5080320, while the sum is 56.

The square root of 65687879 is about 8104.8059199465. The cubic root of 65687879 is about 403.4859467698.

It can be divided in two parts, 65687 and 879, that added together give a palindrome (66566).

The spelling of 65687879 in words is "sixty-five million, six hundred eighty-seven thousand, eight hundred seventy-nine".