7977644846 has 4 divisors (see below), whose sum is σ = 11966467272. Its totient is φ = 3988822422.

The previous prime is 7977644839. The next prime is 7977644861. The reversal of 7977644846 is 6484467797.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6484467797 = 53 ⋅122348449.

It is a congruent 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 as a sum of consecutive naturals, namely, 1994411210 + ... + 1994411213.

It is an arithmetic number, because the mean of its divisors is an integer number (2991616818).

Almost surely, 2^7977644846 is an apocalyptic number.

7977644846 is a deficient number, since it is larger than the sum of its proper divisors (3988822426).

7977644846 is a wasteful number, since it uses less digits than its factorization.

7977644846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3988822425.

The product of its digits is 56899584, while the sum is 62.

The square root of 7977644846 is about 89317.6625645790. The cubic root of 7977644846 is about 1998.1353325479.

The spelling of 7977644846 in words is "seven billion, nine hundred seventy-seven million, six hundred forty-four thousand, eight hundred forty-six".