7800686885 has 4 divisors (see below), whose sum is σ = 9360824268. Its totient is φ = 6240549504.

The previous prime is 7800686879. The next prime is 7800686897. The reversal of 7800686885 is 5886860087.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5151937729 + 2648749156 = 71777^2 + 51466^2 .

It is a cyclic number.

It is not a de Polignac number, because 7800686885 - 2⁴ = 7800686869 is a prime.

It is a super-2 number, since 2×7800686885² (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 7800686885.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 780068684 + ... + 780068693.

It is an arithmetic number, because the mean of its divisors is an integer number (2340206067).

Almost surely, 2^7800686885 is an apocalyptic number.

It is an amenable number.

7800686885 is a deficient number, since it is larger than the sum of its proper divisors (1560137383).

7800686885 is a wasteful number, since it uses less digits than its factorization.

7800686885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560137382.

The product of its (nonzero) digits is 5160960, while the sum is 56.

The square root of 7800686885 is about 88321.4972982229. The cubic root of 7800686885 is about 1983.2506957228.

The spelling of 7800686885 in words is "seven billion, eight hundred million, six hundred eighty-six thousand, eight hundred eighty-five".