7813912885 has 4 divisors (see below), whose sum is σ = 9376695468. Its totient is φ = 6251130304.

The previous prime is 7813912853. The next prime is 7813912901. The reversal of 7813912885 is 5882193187.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5882193187 = 13 ⋅452476399.

It can be written as a sum of positive squares in 2 ways, for example, as 1015250769 + 6798662116 = 31863^2 + 82454^2 .

It is a cyclic number.

It is not a de Polignac number, because 7813912885 - 2⁵ = 7813912853 is a prime.

It is a super-2 number, since 2×7813912885² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

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, 781391284 + ... + 781391293.

It is an arithmetic number, because the mean of its divisors is an integer number (2344173867).

Almost surely, 2^7813912885 is an apocalyptic number.

It is an amenable number.

7813912885 is a deficient number, since it is larger than the sum of its proper divisors (1562782583).

7813912885 is a wasteful number, since it uses less digits than its factorization.

7813912885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1562782582.

The product of its digits is 967680, while the sum is 52.

The square root of 7813912885 is about 88396.3397715086. The cubic root of 7813912885 is about 1984.3709245573.

The spelling of 7813912885 in words is "seven billion, eight hundred thirteen million, nine hundred twelve thousand, eight hundred eighty-five".