78797869 has 2 divisors, whose sum is σ = 78797870. Its totient is φ = 78797868.

The previous prime is 78797861. The next prime is 78797881. The reversal of 78797869 is 96879787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55323844 + 23474025 = 7438^2 + 4845^2 .

It is a cyclic number.

It is not a de Polignac number, because 78797869 - 2³ = 78797861 is a prime.

It is a super-2 number, since 2×78797869² = 12418208317882322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78797861) 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, 39398934 + 39398935.

It is an arithmetic number, because the mean of its divisors is an integer number (39398935).

Almost surely, 2^78797869 is an apocalyptic number.

It is an amenable number.

78797869 is a deficient number, since it is larger than the sum of its proper divisors (1).

78797869 is an equidigital number, since it uses as much as digits as its factorization.

78797869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10668672, while the sum is 61.

The square root of 78797869 is about 8876.8163775083. The cubic root of 78797869 is about 428.7177757715.

The spelling of 78797869 in words is "seventy-eight million, seven hundred ninety-seven thousand, eight hundred sixty-nine".