89217729 has 6 divisors (see below), whose sum is σ = 128870066. Its totient is φ = 59478480.

The previous prime is 89217727. The next prime is 89217743. The reversal of 89217729 is 92771298.

It can be written as a sum of positive squares in only one way, i.e., 87890625 + 1327104 = 9375^2 + 1152^2 .

It is not a de Polignac number, because 89217729 - 2¹ = 89217727 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (89217727) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4956532 + ... + 4956549.

Almost surely, 2^89217729 is an apocalyptic number.

It is an amenable number.

89217729 is a deficient number, since it is larger than the sum of its proper divisors (39652337).

89217729 is a wasteful number, since it uses less digits than its factorization.

89217729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9913087 (or 9913084 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 89217729 is about 9445.5136969886. The cubic root of 89217729 is about 446.8382971405.

The spelling of 89217729 in words is "eighty-nine million, two hundred seventeen thousand, seven hundred twenty-nine".