7881385269 has 16 divisors (see below), whose sum is σ = 11331391680. Its totient is φ = 4856307840.

The previous prime is 7881385243. The next prime is 7881385273. The reversal of 7881385269 is 9625831887.

It is a happy number.

It is not a de Polignac number, because 7881385269 - 2¹¹ = 7881383221 is a prime.

It is a super-2 number, since 2×7881385269² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7881385069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1683882 + ... + 1688555.

It is an arithmetic number, because the mean of its divisors is an integer number (708211980).

Almost surely, 2^7881385269 is an apocalyptic number.

It is an amenable number.

7881385269 is a deficient number, since it is larger than the sum of its proper divisors (3450006411).

7881385269 is a wasteful number, since it uses less digits than its factorization.

7881385269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3372500.

The product of its digits is 5806080, while the sum is 57.

The square root of 7881385269 is about 88777.1663717648. The cubic root of 7881385269 is about 1990.0661803870.

The spelling of 7881385269 in words is "seven billion, eight hundred eighty-one million, three hundred eighty-five thousand, two hundred sixty-nine".