78865305 has 16 divisors (see below), whose sum is σ = 127783680. Its totient is φ = 41528448.

The previous prime is 78865301. The next prime is 78865307. The reversal of 78865305 is 50356887.

It is not a de Polignac number, because 78865305 - 2² = 78865301 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78865301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32092 + ... + 34461.

It is an arithmetic number, because the mean of its divisors is an integer number (7986480).

Almost surely, 2^78865305 is an apocalyptic number.

It is an amenable number.

78865305 is a deficient number, since it is larger than the sum of its proper divisors (48918375).

78865305 is a wasteful number, since it uses less digits than its factorization.

78865305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66640.

The product of its (nonzero) digits is 201600, while the sum is 42.

The square root of 78865305 is about 8880.6139990431. The cubic root of 78865305 is about 428.8400412116.

The spelling of 78865305 in words is "seventy-eight million, eight hundred sixty-five thousand, three hundred five".