78068819 has 4 divisors (see below), whose sum is σ = 80587200. Its totient is φ = 75550440.

The previous prime is 78068813. The next prime is 78068821. The reversal of 78068819 is 91886087.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91886087 = 5783 ⋅15889.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78068819 is a prime.

It is a super-2 number, since 2×78068819² = 12189481000109522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78068813) 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, 1259144 + ... + 1259205.

It is an arithmetic number, because the mean of its divisors is an integer number (20146800).

Almost surely, 2^78068819 is an apocalyptic number.

78068819 is a deficient number, since it is larger than the sum of its proper divisors (2518381).

78068819 is a wasteful number, since it uses less digits than its factorization.

78068819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2518380.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 78068819 is about 8835.6561159882. The cubic root of 78068819 is about 427.3914893935.

It can be divided in two parts, 78068 and 819, that added together give a palindrome (78887).

The spelling of 78068819 in words is "seventy-eight million, sixty-eight thousand, eight hundred nineteen".