87855793 has 2 divisors, whose sum is σ = 87855794. Its totient is φ = 87855792.

The previous prime is 87855739. The next prime is 87855809. The reversal of 87855793 is 39755878.

Together with previous prime (87855739) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71791729 + 16064064 = 8473^2 + 4008^2 .

It is a cyclic number.

It is not a de Polignac number, because 87855793 - 2¹³ = 87847601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87855793.

It is not a weakly prime, because it can be changed into another prime (87850793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43927896 + 43927897.

It is an arithmetic number, because the mean of its divisors is an integer number (43927897).

Almost surely, 2^87855793 is an apocalyptic number.

It is an amenable number.

87855793 is a deficient number, since it is larger than the sum of its proper divisors (1).

87855793 is an equidigital number, since it uses as much as digits as its factorization.

87855793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2116800, while the sum is 52.

The square root of 87855793 is about 9373.1421092396. The cubic root of 87855793 is about 444.5529205058.

The spelling of 87855793 in words is "eighty-seven million, eight hundred fifty-five thousand, seven hundred ninety-three".