78254849 has 2 divisors, whose sum is σ = 78254850. Its totient is φ = 78254848.

The previous prime is 78254837. The next prime is 78254857. The reversal of 78254849 is 94845287.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60949249 + 17305600 = 7807^2 + 4160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78254849 is a prime.

It is a super-2 number, since 2×78254849² = 12247642784025602, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (78254899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39127424 + 39127425.

It is an arithmetic number, because the mean of its divisors is an integer number (39127425).

Almost surely, 2^78254849 is an apocalyptic number.

It is an amenable number.

78254849 is a deficient number, since it is larger than the sum of its proper divisors (1).

78254849 is an equidigital number, since it uses as much as digits as its factorization.

78254849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 47.

The square root of 78254849 is about 8846.1770839160. The cubic root of 78254849 is about 427.7306968193.

The spelling of 78254849 in words is "seventy-eight million, two hundred fifty-four thousand, eight hundred forty-nine".