78204769 has 2 divisors, whose sum is σ = 78204770. Its totient is φ = 78204768.

The previous prime is 78204767. The next prime is 78204781. The reversal of 78204769 is 96740287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62204769 + 16000000 = 7887^2 + 4000^2 .

It is a cyclic number.

It is not a de Polignac number, because 78204769 - 2¹ = 78204767 is a prime.

It is a super-2 number, since 2×78204769² = 12231971788686722, which contains 22 as substring.

Together with 78204767, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78204767) 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, 39102384 + 39102385.

It is an arithmetic number, because the mean of its divisors is an integer number (39102385).

Almost surely, 2^78204769 is an apocalyptic number.

It is an amenable number.

78204769 is a deficient number, since it is larger than the sum of its proper divisors (1).

78204769 is an equidigital number, since it uses as much as digits as its factorization.

78204769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 78204769 is about 8843.3460296429. The cubic root of 78204769 is about 427.6394337872.

The spelling of 78204769 in words is "seventy-eight million, two hundred four thousand, seven hundred sixty-nine".