78180513 has 8 divisors (see below), whose sum is σ = 105215328. Its totient is φ = 51633024.

The previous prime is 78180511. The next prime is 78180547. The reversal of 78180513 is 31508187.

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

It is not a de Polignac number, because 78180513 - 2¹ = 78180511 is a prime.

It is a super-2 number, since 2×78180513² = 12224385225886338, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78180511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121456 + ... + 122097.

It is an arithmetic number, because the mean of its divisors is an integer number (13151916).

Almost surely, 2^78180513 is an apocalyptic number.

It is an amenable number.

78180513 is a deficient number, since it is larger than the sum of its proper divisors (27034815).

78180513 is a wasteful number, since it uses less digits than its factorization.

78180513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243663.

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 78180513 is about 8841.9744966834. The cubic root of 78180513 is about 427.5952169837.

The spelling of 78180513 in words is "seventy-eight million, one hundred eighty thousand, five hundred thirteen".