7977960849 has 16 divisors (see below), whose sum is σ = 11106271872. Its totient is φ = 5084416128.

The previous prime is 7977960847. The next prime is 7977960857. The reversal of 7977960849 is 9480697797.

It is not a de Polignac number, because 7977960849 - 2¹ = 7977960847 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7977960849.

It is not an unprimeable number, because it can be changed into a prime (7977960841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87979 + ... + 153935.

It is an arithmetic number, because the mean of its divisors is an integer number (694141992).

Almost surely, 2^7977960849 is an apocalyptic number.

It is an amenable number.

7977960849 is a deficient number, since it is larger than the sum of its proper divisors (3128311023).

7977960849 is a wasteful number, since it uses less digits than its factorization.

7977960849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67736.

The product of its (nonzero) digits is 48009024, while the sum is 66.

The square root of 7977960849 is about 89319.4315308825. The cubic root of 7977960849 is about 1998.1617149551.

The spelling of 7977960849 in words is "seven billion, nine hundred seventy-seven million, nine hundred sixty thousand, eight hundred forty-nine".