78692461 has 2 divisors, whose sum is σ = 78692462. Its totient is φ = 78692460.

The previous prime is 78692459. The next prime is 78692479. The reversal of 78692461 is 16429687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41409225 + 37283236 = 6435^2 + 6106^2 .

It is an emirp because it is prime and its reverse (16429687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78692461 - 2¹ = 78692459 is a prime.

Together with 78692459, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78692431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39346230 + 39346231.

It is an arithmetic number, because the mean of its divisors is an integer number (39346231).

Almost surely, 2^78692461 is an apocalyptic number.

It is an amenable number.

78692461 is a deficient number, since it is larger than the sum of its proper divisors (1).

78692461 is an equidigital number, since it uses as much as digits as its factorization.

78692461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 43.

The square root of 78692461 is about 8870.8771268686. The cubic root of 78692461 is about 428.5265250467.

The spelling of 78692461 in words is "seventy-eight million, six hundred ninety-two thousand, four hundred sixty-one".