87788791 has 2 divisors, whose sum is σ = 87788792. Its totient is φ = 87788790.

The previous prime is 87788773. The next prime is 87788879. The reversal of 87788791 is 19788778.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87788791 - 2¹³ = 87780599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87788741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43894395 + 43894396.

It is an arithmetic number, because the mean of its divisors is an integer number (43894396).

Almost surely, 2^87788791 is an apocalyptic number.

87788791 is a deficient number, since it is larger than the sum of its proper divisors (1).

87788791 is an equidigital number, since it uses as much as digits as its factorization.

87788791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1580544, while the sum is 55.

The square root of 87788791 is about 9369.5672792291. The cubic root of 87788791 is about 444.4398810619.

The spelling of 87788791 in words is "eighty-seven million, seven hundred eighty-eight thousand, seven hundred ninety-one".