78678719 has 8 divisors (see below), whose sum is σ = 90122400. Its totient is φ = 67286016.

The previous prime is 78678679. The next prime is 78678763. The reversal of 78678719 is 91787687.

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

It is not a de Polignac number, because 78678719 - 2²⁴ = 61901503 is a prime.

It is a super-2 number, since 2×78678719² = 12380681646961922, 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 (78678779) 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, 9374 + ... + 15659.

It is an arithmetic number, because the mean of its divisors is an integer number (11265300).

Almost surely, 2^78678719 is an apocalyptic number.

78678719 is a deficient number, since it is larger than the sum of its proper divisors (11443681).

78678719 is a wasteful number, since it uses less digits than its factorization.

78678719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25489.

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

The square root of 78678719 is about 8870.1025360477. The cubic root of 78678719 is about 428.5015791826.

It can be divided in two parts, 78678 and 719, that added together give a palindrome (79397).

The spelling of 78678719 in words is "seventy-eight million, six hundred seventy-eight thousand, seven hundred nineteen".