88866221 has 4 divisors (see below), whose sum is σ = 88896444. Its totient is φ = 88836000.

The previous prime is 88866139. The next prime is 88866241. The reversal of 88866221 is 12266888.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62188996 + 26677225 = 7886^2 + 5165^2 .

It is a cyclic number.

It is not a de Polignac number, because 88866221 - 2¹⁰ = 88865197 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88866241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10160 + ... + 16761.

It is an arithmetic number, because the mean of its divisors is an integer number (22224111).

Almost surely, 2^88866221 is an apocalyptic number.

It is an amenable number.

88866221 is a deficient number, since it is larger than the sum of its proper divisors (30223).

88866221 is a wasteful number, since it uses less digits than its factorization.

88866221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30222.

The product of its digits is 73728, while the sum is 41.

The square root of 88866221 is about 9426.8881928238. Note that the first 3 decimals coincide. The cubic root of 88866221 is about 446.2506935835.

The spelling of 88866221 in words is "eighty-eight million, eight hundred sixty-six thousand, two hundred twenty-one".