78649345 has 8 divisors (see below), whose sum is σ = 94426920. Its totient is φ = 62887680.

The previous prime is 78649339. The next prime is 78649367. The reversal of 78649345 is 54394687.

It can be written as a sum of positive squares in 4 ways, for example, as 20142144 + 58507201 = 4488^2 + 7649^2 .

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

It is not a de Polignac number, because 78649345 - 2⁷ = 78649217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78649295 and 78649304.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16425 + ... + 20665.

It is an arithmetic number, because the mean of its divisors is an integer number (11803365).

Almost surely, 2^78649345 is an apocalyptic number.

It is an amenable number.

78649345 is a deficient number, since it is larger than the sum of its proper divisors (15777575).

78649345 is a wasteful number, since it uses less digits than its factorization.

78649345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7955.

The product of its digits is 725760, while the sum is 46.

The square root of 78649345 is about 8868.4465945283. The cubic root of 78649345 is about 428.4482467937.

The spelling of 78649345 in words is "seventy-eight million, six hundred forty-nine thousand, three hundred forty-five".