7921765980 has 168 divisors, whose sum is σ = 25367655600. Its totient is φ = 2076440832.

The previous prime is 7921765963. The next prime is 7921765981. The reversal of 7921765980 is 895671297.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7921765981) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 855616 + ... + 864824.

It is an arithmetic number, because the mean of its divisors is an integer number (150997950).

Almost surely, 2^7921765980 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 7921765980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12683827800).

7921765980 is an abundant number, since it is smaller than the sum of its proper divisors (17445889620).

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

7921765980 is a wasteful number, since it uses less digits than its factorization.

7921765980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9295 (or 9278 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 54.

The square root of 7921765980 is about 89004.3031543981. The cubic root of 7921765980 is about 1993.4591301641.

The spelling of 7921765980 in words is "seven billion, nine hundred twenty-one million, seven hundred sixty-five thousand, nine hundred eighty".