78499 has 4 divisors (see below), whose sum is σ = 81936. Its totient is φ = 75064.

The previous prime is 78497. The next prime is 78509. The reversal of 78499 is 99487.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 78499 - 2¹ = 78497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78497) 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, 1684 + ... + 1729.

It is an arithmetic number, because the mean of its divisors is an integer number (20484).

2⁷⁸⁴⁹⁹ is an apocalyptic number.

78499 is a deficient number, since it is larger than the sum of its proper divisors (3437).

78499 is a wasteful number, since it uses less digits than its factorization.

78499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3436.

The product of its digits is 18144, while the sum is 37.

The square root of 78499 is about 280.1767299402. The cubic root of 78499 is about 42.8175067404.

The spelling of 78499 in words is "seventy-eight thousand, four hundred ninety-nine".