78845705 has 8 divisors (see below), whose sum is σ = 97172232. Its totient is φ = 61371648.

The previous prime is 78845671. The next prime is 78845729. The reversal of 78845705 is 50754887.

It can be written as a sum of positive squares in 4 ways, for example, as 47720464 + 31125241 = 6908^2 + 5579^2 .

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 78845705 - 2¹⁴ = 78829321 is a prime.

It is a Duffinian number.

It is a Curzon 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, 212912 + ... + 213281.

It is an arithmetic number, because the mean of its divisors is an integer number (12146529).

Almost surely, 2^78845705 is an apocalyptic number.

It is an amenable number.

78845705 is a deficient number, since it is larger than the sum of its proper divisors (18326527).

78845705 is a wasteful number, since it uses less digits than its factorization.

78845705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426235.

The product of its (nonzero) digits is 313600, while the sum is 44.

The square root of 78845705 is about 8879.5104031698. The cubic root of 78845705 is about 428.8045124443.

The spelling of 78845705 in words is "seventy-eight million, eight hundred forty-five thousand, seven hundred five".