89668781 has 2 divisors, whose sum is σ = 89668782. Its totient is φ = 89668780.

The previous prime is 89668759. The next prime is 89668793. The reversal of 89668781 is 18786698.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82646281 + 7022500 = 9091^2 + 2650^2 .

It is a cyclic number.

It is not a de Polignac number, because 89668781 - 2¹⁰ = 89667757 is a prime.

It is a super-2 number, since 2×89668781² = 16080980572051922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89608781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44834390 + 44834391.

It is an arithmetic number, because the mean of its divisors is an integer number (44834391).

Almost surely, 2^89668781 is an apocalyptic number.

It is an amenable number.

89668781 is a deficient number, since it is larger than the sum of its proper divisors (1).

89668781 is an equidigital number, since it uses as much as digits as its factorization.

89668781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 53.

The square root of 89668781 is about 9469.3601156572. The cubic root of 89668781 is about 447.5900483561.

The spelling of 89668781 in words is "eighty-nine million, six hundred sixty-eight thousand, seven hundred eighty-one".