3887312805 has 12 divisors (see below), whose sum is σ = 6738008940. Its totient is φ = 2073233472.

The previous prime is 3887312783. The next prime is 3887312831. The reversal of 3887312805 is 5082137883.

It can be written as a sum of positive squares in 2 ways, for example, as 1773336321 + 2113976484 = 42111^2 + 45978^2 .

It is not a de Polignac number, because 3887312805 - 2¹⁰ = 3887311781 is a prime.

It is a super-2 number, since 2×3887312805² = 30222401687833936050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 86384729 = 3887312805 / (3 + 8 + 8 + 7 + 3 + 1 + 2 + 8 + 0 + 5).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43192320 + ... + 43192409.

It is an arithmetic number, because the mean of its divisors is an integer number (561500745).

Almost surely, 2^3887312805 is an apocalyptic number.

It is an amenable number.

3887312805 is a deficient number, since it is larger than the sum of its proper divisors (2850696135).

3887312805 is a wasteful number, since it uses less digits than its factorization.

3887312805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86384740 (or 86384737 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 3887312805 is about 62348.3183814929. The cubic root of 3887312805 is about 1572.3521890717.

The spelling of 3887312805 in words is "three billion, eight hundred eighty-seven million, three hundred twelve thousand, eight hundred five".