78748393 has 2 divisors, whose sum is σ = 78748394. Its totient is φ = 78748392.

The previous prime is 78748391. The next prime is 78748399. The reversal of 78748393 is 39384787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67371264 + 11377129 = 8208^2 + 3373^2 .

It is a cyclic number.

It is not a de Polignac number, because 78748393 - 2¹ = 78748391 is a prime.

Together with 78748391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78748391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39374196 + 39374197.

It is an arithmetic number, because the mean of its divisors is an integer number (39374197).

Almost surely, 2^78748393 is an apocalyptic number.

It is an amenable number.

78748393 is a deficient number, since it is larger than the sum of its proper divisors (1).

78748393 is an equidigital number, since it uses as much as digits as its factorization.

78748393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 49.

The square root of 78748393 is about 8874.0291299950. The cubic root of 78748393 is about 428.6280284983.

The spelling of 78748393 in words is "seventy-eight million, seven hundred forty-eight thousand, three hundred ninety-three".