7992581620 has 72 divisors (see below), whose sum is σ = 17915154264. Its totient is φ = 2984804352.

The previous prime is 7992581561. The next prime is 7992581651. The reversal of 7992581620 is 261852997.

It can be written as a sum of positive squares in 12 ways, for example, as 340181136 + 7652400484 = 18444^2 + 87478^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22901206 + ... + 22901554.

It is an arithmetic number, because the mean of its divisors is an integer number (248821587).

Almost surely, 2^7992581620 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 7992581620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8957577132).

7992581620 is an abundant number, since it is smaller than the sum of its proper divisors (9922572644).

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

7992581620 is a wasteful number, since it uses less digits than its factorization.

7992581620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917 (or 566 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 7992581620 is about 89401.2394768663. The cubic root of 7992581620 is about 1999.3816104836.

The spelling of 7992581620 in words is "seven billion, nine hundred ninety-two million, five hundred eighty-one thousand, six hundred twenty".