78428741 has 2 divisors, whose sum is σ = 78428742. Its totient is φ = 78428740.

The previous prime is 78428719. The next prime is 78428771. The reversal of 78428741 is 14782487.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50908225 + 27520516 = 7135^2 + 5246^2 .

It is a cyclic number.

It is not a de Polignac number, because 78428741 - 2⁶ = 78428677 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78428771) 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, 39214370 + 39214371.

It is an arithmetic number, because the mean of its divisors is an integer number (39214371).

Almost surely, 2^78428741 is an apocalyptic number.

It is an amenable number.

78428741 is a deficient number, since it is larger than the sum of its proper divisors (1).

78428741 is an equidigital number, since it uses as much as digits as its factorization.

78428741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100352, while the sum is 41.

The square root of 78428741 is about 8856.0002822945. Note that the first 3 decimals coincide. The cubic root of 78428741 is about 428.0472860237.

The spelling of 78428741 in words is "seventy-eight million, four hundred twenty-eight thousand, seven hundred forty-one".