7801487979 has 16 divisors (see below), whose sum is σ = 10672041600. Its totient is φ = 5066603136.

The previous prime is 7801487977. The next prime is 7801488001. The reversal of 7801487979 is 9797841087.

It is not a de Polignac number, because 7801487979 - 2¹ = 7801487977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7801487977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30894 + ... + 128675.

It is an arithmetic number, because the mean of its divisors is an integer number (667002600).

Almost surely, 2^7801487979 is an apocalyptic number.

7801487979 is a deficient number, since it is larger than the sum of its proper divisors (2870553621).

7801487979 is a wasteful number, since it uses less digits than its factorization.

7801487979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159994.

The product of its (nonzero) digits is 7112448, while the sum is 60.

The square root of 7801487979 is about 88326.0322838063. The cubic root of 7801487979 is about 1983.3185835842.

The spelling of 7801487979 in words is "seven billion, eight hundred one million, four hundred eighty-seven thousand, nine hundred seventy-nine".