78980305 has 4 divisors (see below), whose sum is σ = 94776372. Its totient is φ = 63184240.

The previous prime is 78980303. The next prime is 78980327. The reversal of 78980305 is 50308987.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44675856 + 34304449 = 6684^2 + 5857^2 .

It is not a de Polignac number, because 78980305 - 2¹ = 78980303 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78980303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7898026 + ... + 7898035.

It is an arithmetic number, because the mean of its divisors is an integer number (23694093).

Almost surely, 2^78980305 is an apocalyptic number.

It is an amenable number.

78980305 is a deficient number, since it is larger than the sum of its proper divisors (15796067).

78980305 is a wasteful number, since it uses less digits than its factorization.

78980305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15796066.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 78980305 is about 8887.0864179437. The cubic root of 78980305 is about 429.0483823119.

The spelling of 78980305 in words is "seventy-eight million, nine hundred eighty thousand, three hundred five".