78093761 has 2 divisors, whose sum is σ = 78093762. Its totient is φ = 78093760.

The previous prime is 78093749. The next prime is 78093797. The reversal of 78093761 is 16739087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52287361 + 25806400 = 7231^2 + 5080^2 .

It is a cyclic number.

It is not a de Polignac number, because 78093761 - 2²² = 73899457 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (78092761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39046880 + 39046881.

It is an arithmetic number, because the mean of its divisors is an integer number (39046881).

Almost surely, 2^78093761 is an apocalyptic number.

It is an amenable number.

78093761 is a deficient number, since it is larger than the sum of its proper divisors (1).

78093761 is an equidigital number, since it uses as much as digits as its factorization.

78093761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 78093761 is about 8837.0674434453. The cubic root of 78093761 is about 427.4369999384.

The spelling of 78093761 in words is "seventy-eight million, ninety-three thousand, seven hundred sixty-one".