78513 has 4 divisors (see below), whose sum is σ = 104688. Its totient is φ = 52340.

The previous prime is 78511. The next prime is 78517. The reversal of 78513 is 31587.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31587 = 3 ⋅10529.

It is a cyclic number.

It is not a de Polignac number, because 78513 - 2¹ = 78511 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (78511) 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, 13083 + ... + 13088.

It is an arithmetic number, because the mean of its divisors is an integer number (26172).

2⁷⁸⁵¹³ is an apocalyptic number.

It is an amenable number.

78513 is a deficient number, since it is larger than the sum of its proper divisors (26175).

78513 is a wasteful number, since it uses less digits than its factorization.

78513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26174.

The product of its digits is 840, while the sum is 24.

The square root of 78513 is about 280.2017130569. The cubic root of 78513 is about 42.8200520359.

The spelling of 78513 in words is "seventy-eight thousand, five hundred thirteen".