89773821 has 24 divisors (see below), whose sum is σ = 142042680. Its totient is φ = 54383616.

The previous prime is 89773819. The next prime is 89773837. The reversal of 89773821 is 12837798.

It can be written as a sum of positive squares in 4 ways, for example, as 25613721 + 64160100 = 5061^2 + 8010^2 .

It is not a de Polignac number, because 89773821 - 2¹ = 89773819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89775821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5680 + ... + 14553.

It is an arithmetic number, because the mean of its divisors is an integer number (5918445).

Almost surely, 2^89773821 is an apocalyptic number.

It is an amenable number.

89773821 is a deficient number, since it is larger than the sum of its proper divisors (52268859).

89773821 is a wasteful number, since it uses less digits than its factorization.

89773821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20285 (or 20282 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 89773821 is about 9474.9048016326. The cubic root of 89773821 is about 447.7647524616.

The spelling of 89773821 in words is "eighty-nine million, seven hundred seventy-three thousand, eight hundred twenty-one".