78081313 has 4 divisors (see below), whose sum is σ = 78839488. Its totient is φ = 77323140.

The previous prime is 78081307. The next prime is 78081347. The reversal of 78081313 is 31318087.

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.

It is a cyclic number.

It is not a de Polignac number, because 78081313 - 2⁹ = 78080801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78081413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378933 + ... + 379138.

It is an arithmetic number, because the mean of its divisors is an integer number (19709872).

Almost surely, 2^78081313 is an apocalyptic number.

It is an amenable number.

78081313 is a deficient number, since it is larger than the sum of its proper divisors (758175).

78081313 is a wasteful number, since it uses less digits than its factorization.

78081313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758174.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 78081313 is about 8836.3631093341. The cubic root of 78081313 is about 427.4142878445.

The spelling of 78081313 in words is "seventy-eight million, eighty-one thousand, three hundred thirteen".