78864241 has 4 divisors (see below), whose sum is σ = 83503332. Its totient is φ = 74225152.

The previous prime is 78864229. The next prime is 78864257. The reversal of 78864241 is 14246887.

78864241 = 6279² + 6280².

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 39438400 + 39425841 = 6280^2 + 6279^2 .

It is a cyclic number.

It is not a de Polignac number, because 78864241 - 2²³ = 70475633 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 a junction number, because it is equal to n+sod(n) for n = 78864194 and 78864203.

It is not an unprimeable number, because it can be changed into a prime (78864221) 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, 2319520 + ... + 2319553.

It is an arithmetic number, because the mean of its divisors is an integer number (20875833).

Almost surely, 2^78864241 is an apocalyptic number.

78864241 is the 6280-th centered square number.

It is an amenable number.

78864241 is a deficient number, since it is larger than the sum of its proper divisors (4639091).

78864241 is a wasteful number, since it uses less digits than its factorization.

78864241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4639090.

The product of its digits is 86016, while the sum is 40.

The square root of 78864241 is about 8880.5540930732. The cubic root of 78864241 is about 428.8381126582.

The spelling of 78864241 in words is "seventy-eight million, eight hundred sixty-four thousand, two hundred forty-one".