68787819 has 16 divisors (see below), whose sum is σ = 102071200. Its totient is φ = 45785088.

The previous prime is 68787781. The next prime is 68787857. The reversal of 68787819 is 91878786.

It is an interprime number because it is at equal distance from previous prime (68787781) and next prime (68787857).

It is not a de Polignac number, because 68787819 - 2¹² = 68783723 is a prime.

It is a super-2 number, since 2×68787819² = 9463528085553522, 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 (68787919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19107 + ... + 22419.

It is an arithmetic number, because the mean of its divisors is an integer number (6379450).

Almost surely, 2^68787819 is an apocalyptic number.

68787819 is a deficient number, since it is larger than the sum of its proper divisors (33283381).

68787819 is a wasteful number, since it uses less digits than its factorization.

68787819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4091 (or 4085 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The square root of 68787819 is about 8293.8422338504. The cubic root of 68787819 is about 409.7357388910.

The spelling of 68787819 in words is "sixty-eight million, seven hundred eighty-seven thousand, eight hundred nineteen".