78345565 has 8 divisors (see below), whose sum is σ = 94318848. Its totient is φ = 62473680.

The previous prime is 78345557. The next prime is 78345581. The reversal of 78345565 is 56554387.

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

It is not a de Polignac number, because 78345565 - 2³ = 78345557 is a prime.

It is a super-2 number, since 2×78345565² = 12276055110338450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23637 + ... + 26746.

It is an arithmetic number, because the mean of its divisors is an integer number (11789856).

Almost surely, 2^78345565 is an apocalyptic number.

It is an amenable number.

78345565 is a deficient number, since it is larger than the sum of its proper divisors (15973283).

78345565 is a wasteful number, since it uses less digits than its factorization.

78345565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50699.

The product of its digits is 504000, while the sum is 43.

The square root of 78345565 is about 8851.3030114215. The cubic root of 78345565 is about 427.8959135628.

The spelling of 78345565 in words is "seventy-eight million, three hundred forty-five thousand, five hundred sixty-five".