7720777650 has 96 divisors (see below), whose sum is σ = 19985470848. Its totient is φ = 1970675200.

The previous prime is 7720777607. The next prime is 7720777723. The reversal of 7720777650 is 567770277.

It is a happy number.

It is a super-2 number, since 2×7720777650² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7720777650.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 314107 + ... + 337793.

It is an arithmetic number, because the mean of its divisors is an integer number (208181988).

Almost surely, 2^7720777650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7720777650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9992735424).

7720777650 is an abundant number, since it is smaller than the sum of its proper divisors (12264693198).

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

7720777650 is a wasteful number, since it uses less digits than its factorization.

7720777650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23796 (or 23791 counting only the distinct ones).

The product of its (nonzero) digits is 1008420, while the sum is 48.

The square root of 7720777650 is about 87867.9557631791. The cubic root of 7720777650 is about 1976.4553840237.

The spelling of 7720777650 in words is "seven billion, seven hundred twenty million, seven hundred seventy-seven thousand, six hundred fifty".