78449422 has 4 divisors (see below), whose sum is σ = 117674136. Its totient is φ = 39224710.

The previous prime is 78449417. The next prime is 78449443. The reversal of 78449422 is 22494487.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19612354 + ... + 19612357.

It is an arithmetic number, because the mean of its divisors is an integer number (29418534).

Almost surely, 2^78449422 is an apocalyptic number.

78449422 is a deficient number, since it is larger than the sum of its proper divisors (39224714).

78449422 is a wasteful number, since it uses less digits than its factorization.

78449422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39224713.

The product of its digits is 129024, while the sum is 40.

The square root of 78449422 is about 8857.1678317620. The cubic root of 78449422 is about 428.0849068747.

The spelling of 78449422 in words is "seventy-eight million, four hundred forty-nine thousand, four hundred twenty-two".