7979747738 has 8 divisors (see below), whose sum is σ = 11972026260. Its totient is φ = 3989072320.

The previous prime is 7979747707. The next prime is 7979747761. The reversal of 7979747738 is 8377479797.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7975025809 + 4721929 = 89303^2 + 2173^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×7979747738² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388253 + ... + 408288.

Almost surely, 2^7979747738 is an apocalyptic number.

7979747738 is a deficient number, since it is larger than the sum of its proper divisors (3992278522).

7979747738 is a wasteful number, since it uses less digits than its factorization.

7979747738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801552.

The product of its digits is 130691232, while the sum is 68.

The square root of 7979747738 is about 89329.4337718537. The cubic root of 7979747738 is about 1998.3108853474.

The spelling of 7979747738 in words is "seven billion, nine hundred seventy-nine million, seven hundred forty-seven thousand, seven hundred thirty-eight".