89819721 has 12 divisors (see below), whose sum is σ = 137371572. Its totient is φ = 56357376.

The previous prime is 89819693. The next prime is 89819729. The reversal of 89819721 is 12791898.

It can be written as a sum of positive squares in 2 ways, for example, as 26378496 + 63441225 = 5136^2 + 7965^2 .

It is not a de Polignac number, because 89819721 - 2¹⁰ = 89818697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (89819729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 293376 + ... + 293681.

It is an arithmetic number, because the mean of its divisors is an integer number (11447631).

Almost surely, 2^89819721 is an apocalyptic number.

It is an amenable number.

89819721 is a deficient number, since it is larger than the sum of its proper divisors (47551851).

89819721 is a wasteful number, since it uses less digits than its factorization.

89819721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587080 (or 587077 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The square root of 89819721 is about 9477.3266800296. The cubic root of 89819721 is about 447.8410512467.

The spelling of 89819721 in words is "eighty-nine million, eight hundred nineteen thousand, seven hundred twenty-one".