89728821 has 48 divisors (see below), whose sum is σ = 161441280. Its totient is φ = 46759680.

The previous prime is 89728799. The next prime is 89728861. The reversal of 89728821 is 12882798.

It is a happy number.

It is not a de Polignac number, because 89728821 - 2⁵ = 89728789 is a prime.

It is a super-2 number, since 2×89728821² = 16102522636100082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89728861) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 72276 + ... + 73506.

It is an arithmetic number, because the mean of its divisors is an integer number (3363360).

Almost surely, 2^89728821 is an apocalyptic number.

It is an amenable number.

89728821 is a deficient number, since it is larger than the sum of its proper divisors (71712459).

89728821 is a wasteful number, since it uses less digits than its factorization.

89728821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346 (or 1343 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 89728821 is about 9472.5298099293. The cubic root of 89728821 is about 447.6899244800.

The spelling of 89728821 in words is "eighty-nine million, seven hundred twenty-eight thousand, eight hundred twenty-one".