87788773 has 2 divisors, whose sum is σ = 87788774. Its totient is φ = 87788772.

The previous prime is 87788761. The next prime is 87788791. The reversal of 87788773 is 37788778.

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., 61748164 + 26040609 = 7858^2 + 5103^2 .

It is a cyclic number.

It is not a de Polignac number, because 87788773 - 2⁵ = 87788741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87788473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43894386 + 43894387.

It is an arithmetic number, because the mean of its divisors is an integer number (43894387).

Almost surely, 2^87788773 is an apocalyptic number.

It is an amenable number.

87788773 is a deficient number, since it is larger than the sum of its proper divisors (1).

87788773 is an equidigital number, since it uses as much as digits as its factorization.

87788773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3687936, while the sum is 55.

The square root of 87788773 is about 9369.5663186724. The cubic root of 87788773 is about 444.4398506863.

The spelling of 87788773 in words is "eighty-seven million, seven hundred eighty-eight thousand, seven hundred seventy-three".