7361221638 has 16 divisors (see below), whose sum is σ = 14929802496. Its totient is φ = 2419180680.

The previous prime is 7361221633. The next prime is 7361221649. The reversal of 7361221638 is 8361221637.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7361221596 and 7361221605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7361221633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8639506 + ... + 8640357.

It is an arithmetic number, because the mean of its divisors is an integer number (933112656).

Almost surely, 2^7361221638 is an apocalyptic number.

7361221638 is an abundant number, since it is smaller than the sum of its proper divisors (7568580858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7361221638 is a wasteful number, since it uses less digits than its factorization.

7361221638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17279939.

The product of its digits is 72576, while the sum is 39.

The square root of 7361221638 is about 85797.5619583680. The cubic root of 7361221638 is about 1945.2852688994.

Subtracting 7361221638 from its reverse (8361221637), we obtain a palindrome (999999999).

The spelling of 7361221638 in words is "seven billion, three hundred sixty-one million, two hundred twenty-one thousand, six hundred thirty-eight".