78530 has 8 divisors (see below), whose sum is σ = 141372. Its totient is φ = 31408.

The previous prime is 78517. The next prime is 78539. The reversal of 78530 is 3587.

It can be written as a sum of positive squares in 2 ways, for example, as 67081 + 11449 = 259^2 + 107^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78496 and 78505.

It is not an unprimeable number, because it can be changed into a prime (78539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3917 + ... + 3936.

2⁷⁸⁵³⁰ is an apocalyptic number.

78530 is a deficient number, since it is larger than the sum of its proper divisors (62842).

78530 is a wasteful number, since it uses less digits than its factorization.

78530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7860.

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

The square root of 78530 is about 280.2320467042. The cubic root of 78530 is about 42.8231423452.

The spelling of 78530 in words is "seventy-eight thousand, five hundred thirty".