7931738977 has 4 divisors (see below), whose sum is σ = 8398311876. Its totient is φ = 7465166080.

The previous prime is 7931738963. The next prime is 7931738999. The reversal of 7931738977 is 7798371397.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7798371397 = 359 ⋅21722483.

It can be written as a sum of positive squares in 2 ways, for example, as 4488866001 + 3442872976 = 66999^2 + 58676^2 .

It is a cyclic number.

It is not a de Polignac number, because 7931738977 - 2¹¹ = 7931736929 is a prime.

It is a super-2 number, since 2×7931738977² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7931738777) by changing a digit.

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, 233286424 + ... + 233286457.

It is an arithmetic number, because the mean of its divisors is an integer number (2099577969).

Almost surely, 2^7931738977 is an apocalyptic number.

It is an amenable number.

7931738977 is a deficient number, since it is larger than the sum of its proper divisors (466572899).

7931738977 is a wasteful number, since it uses less digits than its factorization.

7931738977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466572898.

The product of its digits is 14002632, while the sum is 61.

The square root of 7931738977 is about 89060.3108966053. The cubic root of 7931738977 is about 1994.2953252303.

The spelling of 7931738977 in words is "seven billion, nine hundred thirty-one million, seven hundred thirty-eight thousand, nine hundred seventy-seven".