8232220781 has 4 divisors (see below), whose sum is σ = 8254291452. Its totient is φ = 8210150112.

The previous prime is 8232220771. The next prime is 8232220817. The reversal of 8232220781 is 1870222328.

It is a happy number.

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 5374356100 + 2857864681 = 73310^2 + 53459^2 .

It is a cyclic number.

It is not a de Polignac number, because 8232220781 - 2¹⁴ = 8232204397 is a prime.

It is a super-2 number, since 2×8232220781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8232220771) 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, 11034776 + ... + 11035521.

It is an arithmetic number, because the mean of its divisors is an integer number (2063572863).

Almost surely, 2^8232220781 is an apocalyptic number.

It is an amenable number.

8232220781 is a deficient number, since it is larger than the sum of its proper divisors (22070671).

8232220781 is a wasteful number, since it uses less digits than its factorization.

8232220781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22070670.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 8232220781 is about 90731.5864569776. The cubic root of 8232220781 is about 2019.1674493632.

The spelling of 8232220781 in words is "eight billion, two hundred thirty-two million, two hundred twenty thousand, seven hundred eighty-one".