78305613 has 8 divisors (see below), whose sum is σ = 106954176. Its totient is φ = 50930400.

The previous prime is 78305611. The next prime is 78305627. The reversal of 78305613 is 31650387.

It is a happy number.

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

It is not a de Polignac number, because 78305613 - 2¹ = 78305611 is a prime.

It is a super-2 number, since 2×78305613² = 12263538054611538, 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (78305611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318193 + ... + 318438.

It is an arithmetic number, because the mean of its divisors is an integer number (13369272).

Almost surely, 2^78305613 is an apocalyptic number.

It is an amenable number.

78305613 is a deficient number, since it is larger than the sum of its proper divisors (28648563).

78305613 is a wasteful number, since it uses less digits than its factorization.

78305613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636675.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 78305613 is about 8849.0458807716. The cubic root of 78305613 is about 427.8231666062.

The spelling of 78305613 in words is "seventy-eight million, three hundred five thousand, six hundred thirteen".