7721306444 has 12 divisors (see below), whose sum is σ = 13515524568. Its totient is φ = 3859728000.

The previous prime is 7721306443. The next prime is 7721306447. The reversal of 7721306444 is 4446031277.

It is a junction number, because it is equal to n+sod(n) for n = 7721306398 and 7721306407.

It is not an unprimeable number, because it can be changed into a prime (7721306443) 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, 212357 + ... + 246044.

It is an arithmetic number, because the mean of its divisors is an integer number (1126293714).

Almost surely, 2^7721306444 is an apocalyptic number.

It is an amenable number.

7721306444 is a deficient number, since it is larger than the sum of its proper divisors (5794218124).

7721306444 is a wasteful number, since it uses less digits than its factorization.

7721306444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462616 (or 462614 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 38.

The square root of 7721306444 is about 87870.9647380749. The cubic root of 7721306444 is about 1976.5005052941.

The spelling of 7721306444 in words is "seven billion, seven hundred twenty-one million, three hundred six thousand, four hundred forty-four".