78000049 has 2 divisors, whose sum is σ = 78000050. Its totient is φ = 78000048.

The previous prime is 78000037. The next prime is 78000059. The reversal of 78000049 is 94000087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68807025 + 9193024 = 8295^2 + 3032^2 .

It is a cyclic number.

It is not a de Polignac number, because 78000049 - 2⁵ = 78000017 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 77999990 and 78000026.

It is not a weakly prime, because it can be changed into another prime (78000019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39000024 + 39000025.

It is an arithmetic number, because the mean of its divisors is an integer number (39000025).

Almost surely, 2^78000049 is an apocalyptic number.

It is an amenable number.

78000049 is a deficient number, since it is larger than the sum of its proper divisors (1).

78000049 is an equidigital number, since it uses as much as digits as its factorization.

78000049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 78000049 is about 8831.7636404061. The cubic root of 78000049 is about 427.2659576400.

The spelling of 78000049 in words is "seventy-eight million, forty-nine", and thus it is an aban number and an uban number.