7720645628 has 12 divisors (see below), whose sum is σ = 13518745632. Its totient is φ = 3858146880.

The previous prime is 7720645619. The next prime is 7720645631. The reversal of 7720645628 is 8265460277.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535988 + ... + 550203.

It is an arithmetic number, because the mean of its divisors is an integer number (1126562136).

Almost surely, 2^7720645628 is an apocalyptic number.

It is an amenable number.

7720645628 is a deficient number, since it is larger than the sum of its proper divisors (5798100004).

7720645628 is a wasteful number, since it uses less digits than its factorization.

7720645628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087972 (or 1087970 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 47.

The square root of 7720645628 is about 87867.2045077115. The cubic root of 7720645628 is about 1976.4441184452. Note that the first 3 decimals are identical.

The spelling of 7720645628 in words is "seven billion, seven hundred twenty million, six hundred forty-five thousand, six hundred twenty-eight".