78418079 has 4 divisors (see below), whose sum is σ = 78462384. Its totient is φ = 78373776.

The previous prime is 78418061. The next prime is 78418091. The reversal of 78418079 is 97081487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97081487 = 43 ⋅2257709.

It is a cyclic number.

It is not a de Polignac number, because 78418079 - 2¹⁶ = 78352543 is a prime.

It is a super-2 number, since 2×78418079² = 12298790228100482, 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 (78418049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19382 + ... + 23075.

It is an arithmetic number, because the mean of its divisors is an integer number (19615596).

Almost surely, 2^78418079 is an apocalyptic number.

78418079 is a deficient number, since it is larger than the sum of its proper divisors (44305).

78418079 is a wasteful number, since it uses less digits than its factorization.

78418079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44304.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 78418079 is about 8855.3982970841. The cubic root of 78418079 is about 428.0278881732.

The spelling of 78418079 in words is "seventy-eight million, four hundred eighteen thousand, seventy-nine".