78449194 has 4 divisors (see below), whose sum is σ = 117673794. Its totient is φ = 39224596.

The previous prime is 78449191. The next prime is 78449197. The reversal of 78449194 is 49194487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49194487 = 61 ⋅806467.

It is an interprime number because it is at equal distance from previous prime (78449191) and next prime (78449197).

It can be written as a sum of positive squares in only one way, i.e., 72471169 + 5978025 = 8513^2 + 2445^2 .

It is not an unprimeable number, because it can be changed into a prime (78449191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19612297 + ... + 19612300.

Almost surely, 2^78449194 is an apocalyptic number.

78449194 is a deficient number, since it is larger than the sum of its proper divisors (39224600).

78449194 is a wasteful number, since it uses less digits than its factorization.

78449194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39224599.

The product of its digits is 290304, while the sum is 46.

The square root of 78449194 is about 8857.1549608212. The cubic root of 78449194 is about 428.0844921555.

The spelling of 78449194 in words is "seventy-eight million, four hundred forty-nine thousand, one hundred ninety-four".