7327765621 has 4 divisors (see below), whose sum is σ = 7993926144. Its totient is φ = 6661605100.

The previous prime is 7327765589. The next prime is 7327765667. The reversal of 7327765621 is 1265677237.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1265677237 = 11 ⋅115061567.

It is a cyclic number.

It is not a de Polignac number, because 7327765621 - 2⁵ = 7327765589 is a prime.

It is a super-2 number, since 2×7327765621² (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 (7327765681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333080245 + ... + 333080266.

It is an arithmetic number, because the mean of its divisors is an integer number (1998481536).

Almost surely, 2^7327765621 is an apocalyptic number.

It is an amenable number.

7327765621 is a deficient number, since it is larger than the sum of its proper divisors (666160523).

7327765621 is a wasteful number, since it uses less digits than its factorization.

7327765621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666160522.

The product of its digits is 740880, while the sum is 46.

The square root of 7327765621 is about 85602.3692487539. The cubic root of 7327765621 is about 1942.3337505129. Note that the first 3 decimals are identical.

The spelling of 7327765621 in words is "seven billion, three hundred twenty-seven million, seven hundred sixty-five thousand, six hundred twenty-one".