7720772664 has 128 divisors (see below), whose sum is σ = 23128934400. Its totient is φ = 2120088960.

The previous prime is 7720772659. The next prime is 7720772701. The reversal of 7720772664 is 4662770277.

It is a super-2 number, since 2×7720772664² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81907 + ... + 148829.

It is an arithmetic number, because the mean of its divisors is an integer number (180694800).

Almost surely, 2^7720772664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7720772664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11564467200).

7720772664 is an abundant number, since it is smaller than the sum of its proper divisors (15408161736).

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

7720772664 is a wasteful number, since it uses less digits than its factorization.

7720772664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66985 (or 66981 counting only the distinct ones).

The product of its (nonzero) digits is 1382976, while the sum is 48.

The square root of 7720772664 is about 87867.9273910566. The cubic root of 7720772664 is about 1976.4549585653.

The spelling of 7720772664 in words is "seven billion, seven hundred twenty million, seven hundred seventy-two thousand, six hundred sixty-four".