78051613 has 4 divisors (see below), whose sum is σ = 78215040. Its totient is φ = 77888188.

The previous prime is 78051593. The next prime is 78051619. The reversal of 78051613 is 31615087.

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 78051613 - 2⁹ = 78051101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78051619) 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, 80995 + ... + 81952.

It is an arithmetic number, because the mean of its divisors is an integer number (19553760).

Almost surely, 2^78051613 is an apocalyptic number.

It is an amenable number.

78051613 is a deficient number, since it is larger than the sum of its proper divisors (163427).

78051613 is a wasteful number, since it uses less digits than its factorization.

78051613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163426.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 78051613 is about 8834.6823938385. The cubic root of 78051613 is about 427.3600887295.

The spelling of 78051613 in words is "seventy-eight million, fifty-one thousand, six hundred thirteen".