78503 has 4 divisors (see below), whose sum is σ = 81240. Its totient is φ = 75768.

The previous prime is 78497. The next prime is 78509. The reversal of 78503 is 30587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30587 = 73 ⋅419.

It is an interprime number because it is at equal distance from previous prime (78497) and next prime (78509).

It is a cyclic number.

It is not a de Polignac number, because 78503 - 2⁴ = 78487 is a prime.

It is a d-powerful number, because it can be written as 7³ + 8 + 5⁷ + 0 + 3³ .

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78509) 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, 1325 + ... + 1382.

It is an arithmetic number, because the mean of its divisors is an integer number (20310).

2⁷⁸⁵⁰³ is an apocalyptic number.

78503 is a deficient number, since it is larger than the sum of its proper divisors (2737).

78503 is a wasteful number, since it uses less digits than its factorization.

78503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 78503 is about 280.1838682009. The cubic root of 78503 is about 42.8182339985.

The spelling of 78503 in words is "seventy-eight thousand, five hundred three".