78328276249 has 2 divisors, whose sum is σ = 78328276250. Its totient is φ = 78328276248.

The previous prime is 78328276231. The next prime is 78328276309. The reversal of 78328276249 is 94267282387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51850477849 + 26477798400 = 227707^2 + 162720^2 .

It is a cyclic number.

It is not a de Polignac number, because 78328276249 - 2⁷ = 78328276121 is a prime.

It is a super-2 number, since 2×78328276249² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78328276193 and 78328276202.

It is not a weakly prime, because it can be changed into another prime (78328276219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39164138124 + 39164138125.

It is an arithmetic number, because the mean of its divisors is an integer number (39164138125).

Almost surely, 2^78328276249 is an apocalyptic number.

It is an amenable number.

78328276249 is a deficient number, since it is larger than the sum of its proper divisors (1).

78328276249 is an equidigital number, since it uses as much as digits as its factorization.

78328276249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16257024, while the sum is 58.

The spelling of 78328276249 in words is "seventy-eight billion, three hundred twenty-eight million, two hundred seventy-six thousand, two hundred forty-nine".