7809642891 has 16 divisors (see below), whose sum is σ = 11580244000. Its totient is φ = 5201747424.

The previous prime is 7809642871. The next prime is 7809642917. The reversal of 7809642891 is 1982469087.

It is not a de Polignac number, because 7809642891 - 2¹⁰ = 7809641867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7809642871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99316 + ... + 159633.

It is an arithmetic number, because the mean of its divisors is an integer number (723765250).

Almost surely, 2^7809642891 is an apocalyptic number.

7809642891 is a deficient number, since it is larger than the sum of its proper divisors (3770601109).

7809642891 is a wasteful number, since it uses less digits than its factorization.

7809642891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260075 (or 260069 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The square root of 7809642891 is about 88372.1839211864. The cubic root of 7809642891 is about 1984.0093986497.

The spelling of 7809642891 in words is "seven billion, eight hundred nine million, six hundred forty-two thousand, eight hundred ninety-one".