89661905 has 4 divisors (see below), whose sum is σ = 107594292. Its totient is φ = 71729520.

The previous prime is 89661857. The next prime is 89661917. The reversal of 89661905 is 50916698.

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 70442449 + 19219456 = 8393^2 + 4384^2 .

It is not a de Polignac number, because 89661905 - 2¹⁰ = 89660881 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8966186 + ... + 8966195.

It is an arithmetic number, because the mean of its divisors is an integer number (26898573).

Almost surely, 2^89661905 is an apocalyptic number.

It is an amenable number.

89661905 is a deficient number, since it is larger than the sum of its proper divisors (17932387).

89661905 is a wasteful number, since it uses less digits than its factorization.

89661905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17932386.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 89661905 is about 9468.9970429819. The cubic root of 89661905 is about 447.5786073328.

The spelling of 89661905 in words is "eighty-nine million, six hundred sixty-one thousand, nine hundred five".