78641305 has 8 divisors (see below), whose sum is σ = 94423752. Its totient is φ = 62876928.

The previous prime is 78641291. The next prime is 78641341. The reversal of 78641305 is 50314687.

It can be written as a sum of positive squares in 4 ways, for example, as 1710864 + 76930441 = 1308^2 + 8771^2 .

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 78641305 - 2⁵ = 78641273 is a prime.

It is a Duffinian 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, 8449 + ... + 15121.

It is an arithmetic number, because the mean of its divisors is an integer number (11802969).

Almost surely, 2^78641305 is an apocalyptic number.

It is an amenable number.

78641305 is a deficient number, since it is larger than the sum of its proper divisors (15782447).

78641305 is a wasteful number, since it uses less digits than its factorization.

78641305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9035.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 78641305 is about 8867.9932904801. The cubic root of 78641305 is about 428.4336467938.

The spelling of 78641305 in words is "seventy-eight million, six hundred forty-one thousand, three hundred five".