78523319 has 4 divisors (see below), whose sum is σ = 89740944. Its totient is φ = 67305696.

The previous prime is 78523309. The next prime is 78523327. The reversal of 78523319 is 91332587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91332587 = 281 ⋅325027.

It is a cyclic number.

It is not a de Polignac number, because 78523319 - 2²⁴ = 61746103 is a prime.

It is a super-2 number, since 2×78523319² = 12331823253551522, 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 (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, 5608802 + ... + 5608815.

It is an arithmetic number, because the mean of its divisors is an integer number (22435236).

Almost surely, 2^78523319 is an apocalyptic number.

78523319 is a deficient number, since it is larger than the sum of its proper divisors (11217625).

78523319 is a wasteful number, since it uses less digits than its factorization.

78523319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11217624.

The product of its digits is 45360, while the sum is 38.

The square root of 78523319 is about 8861.3384429216. The cubic root of 78523319 is about 428.2192790682.

The spelling of 78523319 in words is "seventy-eight million, five hundred twenty-three thousand, three hundred nineteen".