7681918320 has 120 divisors (see below), whose sum is σ = 25825284576. Its totient is φ = 2046380544.

The previous prime is 7681918319. The next prime is 7681918331. The reversal of 7681918320 is 238191867.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 760342 + ... + 770378.

Almost surely, 2^7681918320 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 7681918320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12912642288).

7681918320 is an abundant number, since it is smaller than the sum of its proper divisors (18143366256).

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

7681918320 is a wasteful number, since it uses less digits than its factorization.

7681918320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11119 (or 11110 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 7681918320 is about 87646.5533834617. The cubic root of 7681918320 is about 1973.1339160650.

The spelling of 7681918320 in words is "seven billion, six hundred eighty-one million, nine hundred eighteen thousand, three hundred twenty".