7997716540 has 24 divisors (see below), whose sum is σ = 18322042032. Its totient is φ = 2908260480.

The previous prime is 7997716513. The next prime is 7997716543. The reversal of 7997716540 is 456177997.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7997716543) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 18176409 + ... + 18176848.

It is an arithmetic number, because the mean of its divisors is an integer number (763418418).

Almost surely, 2^7997716540 is an apocalyptic number.

It is an amenable number.

7997716540 is an abundant number, since it is smaller than the sum of its proper divisors (10324325492).

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

7997716540 is a wasteful number, since it uses less digits than its factorization.

7997716540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36353277 (or 36353275 counting only the distinct ones).

The product of its (nonzero) digits is 3333960, while the sum is 55.

The square root of 7997716540 is about 89429.9532595204. The cubic root of 7997716540 is about 1999.8096935590.

The spelling of 7997716540 in words is "seven billion, nine hundred ninety-seven million, seven hundred sixteen thousand, five hundred forty".