9764288221 has 4 divisors (see below), whose sum is σ = 9860964444. Its totient is φ = 9667612000.

The previous prime is 9764288201. The next prime is 9764288227. The reversal of 9764288221 is 1228824679.

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 7862368900 + 1901919321 = 88670^2 + 43611^2 .

It is a cyclic number.

It is not a de Polignac number, because 9764288221 - 2¹⁷ = 9764157149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9764288227) 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, 48337960 + ... + 48338161.

It is an arithmetic number, because the mean of its divisors is an integer number (2465241111).

Almost surely, 2^9764288221 is an apocalyptic number.

It is an amenable number.

9764288221 is a deficient number, since it is larger than the sum of its proper divisors (96676223).

9764288221 is a wasteful number, since it uses less digits than its factorization.

9764288221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96676222.

The product of its digits is 774144, while the sum is 49.

The square root of 9764288221 is about 98814.4130225950. The cubic root of 9764288221 is about 2137.3723988714.

The spelling of 9764288221 in words is "nine billion, seven hundred sixty-four million, two hundred eighty-eight thousand, two hundred twenty-one".