78316579 has 8 divisors (see below), whose sum is σ = 85639680. Its totient is φ = 71027400.

The previous prime is 78316577. The next prime is 78316583. The reversal of 78316579 is 97561387.

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

It is a cyclic number.

It is not a de Polignac number, because 78316579 - 2¹ = 78316577 is a prime.

It is a super-2 number, since 2×78316579² = 12266973092526482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78316577) 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, 3519 + ... + 13000.

It is an arithmetic number, because the mean of its divisors is an integer number (10704960).

Almost surely, 2^78316579 is an apocalyptic number.

78316579 is a deficient number, since it is larger than the sum of its proper divisors (7323101).

78316579 is a wasteful number, since it uses less digits than its factorization.

78316579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16961.

The product of its digits is 317520, while the sum is 46.

The square root of 78316579 is about 8849.6654739035. The cubic root of 78316579 is about 427.8431366087.

The spelling of 78316579 in words is "seventy-eight million, three hundred sixteen thousand, five hundred seventy-nine".