78678619 has 4 divisors (see below), whose sum is σ = 78861600. Its totient is φ = 78495640.

The previous prime is 78678583. The next prime is 78678643. The reversal of 78678619 is 91687687.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78678619 - 2¹¹ = 78676571 is a prime.

It is a super-2 number, since 2×78678619² = 12380650175494322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78678679) 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, 90844 + ... + 91705.

It is an arithmetic number, because the mean of its divisors is an integer number (19715400).

Almost surely, 2^78678619 is an apocalyptic number.

78678619 is a deficient number, since it is larger than the sum of its proper divisors (182981).

78678619 is a wasteful number, since it uses less digits than its factorization.

78678619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182980.

The product of its digits is 1016064, while the sum is 52.

The square root of 78678619 is about 8870.0968991325. The cubic root of 78678619 is about 428.5013976418.

It can be divided in two parts, 78678 and 619, that added together give a palindrome (79297).

The spelling of 78678619 in words is "seventy-eight million, six hundred seventy-eight thousand, six hundred nineteen".