7880640768 has 1152 divisors, whose sum is σ = 33624944640. Its totient is φ = 1751777280.

The previous prime is 7880640763. The next prime is 7880640821. The reversal of 7880640768 is 8670460887.

It is a tau number, because it is divible by the number of its divisors (1152).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (7880640763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 117621471 + ... + 117621537.

It is an arithmetic number, because the mean of its divisors is an integer number (29188320).

Almost surely, 2^7880640768 is an apocalyptic number.

7880640768 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7880640768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16812472320).

7880640768 is an abundant number, since it is smaller than the sum of its proper divisors (25744303872).

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

7880640768 is a wasteful number, since it uses less digits than its factorization.

7880640768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 54.

The square root of 7880640768 is about 88772.9731844101. The cubic root of 7880640768 is about 1990.0035157299.

The spelling of 7880640768 in words is "seven billion, eight hundred eighty million, six hundred forty thousand, seven hundred sixty-eight".