78395269 has 2 divisors, whose sum is σ = 78395270. Its totient is φ = 78395268.

The previous prime is 78395231. The next prime is 78395287. The reversal of 78395269 is 96259387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72080100 + 6315169 = 8490^2 + 2513^2 .

It is a cyclic number.

It is not a de Polignac number, because 78395269 - 2¹³ = 78387077 is a prime.

It is a super-2 number, since 2×78395269² = 12291636403164722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78395209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39197634 + 39197635.

It is an arithmetic number, because the mean of its divisors is an integer number (39197635).

Almost surely, 2^78395269 is an apocalyptic number.

It is an amenable number.

78395269 is a deficient number, since it is larger than the sum of its proper divisors (1).

78395269 is an equidigital number, since it uses as much as digits as its factorization.

78395269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 49.

The square root of 78395269 is about 8854.1102884480. The cubic root of 78395269 is about 427.9863830209.

The spelling of 78395269 in words is "seventy-eight million, three hundred ninety-five thousand, two hundred sixty-nine".