78605313 has 4 divisors (see below), whose sum is σ = 104807088. Its totient is φ = 52403540.

The previous prime is 78605311. The next prime is 78605321. The reversal of 78605313 is 31350687.

It is a happy number.

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: 31350687 = 3 ⋅10450229.

It is a cyclic number.

It is not a de Polignac number, because 78605313 - 2¹ = 78605311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78605311) 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, 13100883 + ... + 13100888.

It is an arithmetic number, because the mean of its divisors is an integer number (26201772).

Almost surely, 2^78605313 is an apocalyptic number.

It is an amenable number.

78605313 is a deficient number, since it is larger than the sum of its proper divisors (26201775).

78605313 is a wasteful number, since it uses less digits than its factorization.

78605313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26201774.

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

The square root of 78605313 is about 8865.9637378009. The cubic root of 78605313 is about 428.3682759861.

The spelling of 78605313 in words is "seventy-eight million, six hundred five thousand, three hundred thirteen".