78491443 has 4 divisors (see below), whose sum is σ = 79268688. Its totient is φ = 77714200.

The previous prime is 78491377. The next prime is 78491471. The reversal of 78491443 is 34419487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34419487 = 101 ⋅340787.

It is a cyclic number.

It is not a de Polignac number, because 78491443 - 2⁹ = 78490931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78491396 and 78491405.

It is not an unprimeable number, because it can be changed into a prime (78491143) 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, 388471 + ... + 388672.

It is an arithmetic number, because the mean of its divisors is an integer number (19817172).

Almost surely, 2^78491443 is an apocalyptic number.

78491443 is a deficient number, since it is larger than the sum of its proper divisors (777245).

78491443 is a wasteful number, since it uses less digits than its factorization.

78491443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777244.

The product of its digits is 96768, while the sum is 40.

The square root of 78491443 is about 8859.5396607273. The cubic root of 78491443 is about 428.1613270044.

The spelling of 78491443 in words is "seventy-eight million, four hundred ninety-one thousand, four hundred forty-three".