89663809 has 4 divisors (see below), whose sum is σ = 90036100. Its totient is φ = 89291520.

The previous prime is 89663807. The next prime is 89663837. The reversal of 89663809 is 90836698.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78588225 + 11075584 = 8865^2 + 3328^2 .

It is a cyclic number.

It is not a de Polignac number, because 89663809 - 2¹ = 89663807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89663807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185784 + ... + 186265.

It is an arithmetic number, because the mean of its divisors is an integer number (22509025).

Almost surely, 2^89663809 is an apocalyptic number.

It is an amenable number.

89663809 is a deficient number, since it is larger than the sum of its proper divisors (372291).

89663809 is a wasteful number, since it uses less digits than its factorization.

89663809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372290.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 89663809 is about 9469.0975810792. The cubic root of 89663809 is about 447.5817754699.

Subtracting 89663809 from its reverse (90836698), we obtain a square (1172889 = 1083²).

The spelling of 89663809 in words is "eighty-nine million, six hundred sixty-three thousand, eight hundred nine".