89721216 has 128 divisors (see below), whose sum is σ = 285314400. Its totient is φ = 27592704.

The previous prime is 89721199. The next prime is 89721239. The reversal of 89721216 is 61212798.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43930 + ... + 45926.

Almost surely, 2^89721216 is an apocalyptic number.

89721216 is the 5991-st heptagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 89721216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142657200).

89721216 is an abundant number, since it is smaller than the sum of its proper divisors (195593184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

89721216 is a wasteful number, since it uses less digits than its factorization.

89721216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2033 (or 2015 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 89721216 is about 9472.1283775084. The cubic root of 89721216 is about 447.6772760799.

The spelling of 89721216 in words is "eighty-nine million, seven hundred twenty-one thousand, two hundred sixteen".