7820685089 has 4 divisors (see below), whose sum is σ = 8937925824. Its totient is φ = 6703444356.

The previous prime is 7820685077. The next prime is 7820685091. The reversal of 7820685089 is 9805860287.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 7820685089 - 2¹⁶ = 7820619553 is a prime.

It is a super-2 number, since 2×7820685089² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7820685089.

It is not an unprimeable number, because it can be changed into a prime (7820685289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 558620357 + ... + 558620370.

It is an arithmetic number, because the mean of its divisors is an integer number (2234481456).

Almost surely, 2^7820685089 is an apocalyptic number.

It is an amenable number.

7820685089 is a deficient number, since it is larger than the sum of its proper divisors (1117240735).

7820685089 is a wasteful number, since it uses less digits than its factorization.

7820685089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117240734.

The product of its (nonzero) digits is 1935360, while the sum is 53.

The square root of 7820685089 is about 88434.6373826455. The cubic root of 7820685089 is about 1984.9440341053.

The spelling of 7820685089 in words is "seven billion, eight hundred twenty million, six hundred eighty-five thousand, eighty-nine".