78075761 has 2 divisors, whose sum is σ = 78075762. Its totient is φ = 78075760.

The previous prime is 78075721. The next prime is 78075773. The reversal of 78075761 is 16757087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43970161 + 34105600 = 6631^2 + 5840^2 .

It is a cyclic number.

It is not a de Polignac number, because 78075761 - 2²⁶ = 10966897 is a prime.

It is not a weakly prime, because it can be changed into another prime (78075721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39037880 + 39037881.

It is an arithmetic number, because the mean of its divisors is an integer number (39037881).

Almost surely, 2^78075761 is an apocalyptic number.

It is an amenable number.

78075761 is a deficient number, since it is larger than the sum of its proper divisors (1).

78075761 is an equidigital number, since it uses as much as digits as its factorization.

78075761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82320, while the sum is 41.

The square root of 78075761 is about 8836.0489473520. The cubic root of 78075761 is about 427.4041571219.

The spelling of 78075761 in words is "seventy-eight million, seventy-five thousand, seven hundred sixty-one".