7720445889 has 24 divisors (see below), whose sum is σ = 12014754752. Its totient is φ = 4748997600.

The previous prime is 7720445881. The next prime is 7720445927. The reversal of 7720445889 is 9885440277.

It is a happy number.

It is not a de Polignac number, because 7720445889 - 2³ = 7720445881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7720445881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 285534 + ... + 311400.

Almost surely, 2^7720445889 is an apocalyptic number.

It is an amenable number.

7720445889 is a deficient number, since it is larger than the sum of its proper divisors (4294308863).

7720445889 is a wasteful number, since it uses less digits than its factorization.

7720445889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28437 (or 28434 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 54.

The square root of 7720445889 is about 87866.0679045102. The cubic root of 7720445889 is about 1976.4270742585.

The spelling of 7720445889 in words is "seven billion, seven hundred twenty million, four hundred forty-five thousand, eight hundred eighty-nine".