78523379 has 4 divisors (see below), whose sum is σ = 85661880. Its totient is φ = 71384880.

The previous prime is 78523351. The next prime is 78523433. The reversal of 78523379 is 97332587.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78523379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78523309) 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, 3569234 + ... + 3569255.

It is an arithmetic number, because the mean of its divisors is an integer number (21415470).

Almost surely, 2^78523379 is an apocalyptic number.

78523379 is a deficient number, since it is larger than the sum of its proper divisors (7138501).

78523379 is a wasteful number, since it uses less digits than its factorization.

78523379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7138500.

The product of its digits is 317520, while the sum is 44.

The square root of 78523379 is about 8861.3418284140. The cubic root of 78523379 is about 428.2193881362.

The spelling of 78523379 in words is "seventy-eight million, five hundred twenty-three thousand, three hundred seventy-nine".