7881428881 has 4 divisors (see below), whose sum is σ = 7957947712. Its totient is φ = 7804910052.

The previous prime is 7881428857. The next prime is 7881428921. The reversal of 7881428881 is 1888241887.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1888241887 = 7 ⋅269748841.

It is a cyclic number.

It is not a de Polignac number, because 7881428881 - 2⁹ = 7881428369 is a prime.

It is a super-3 number, since 3×7881428881³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7881428831) 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 3 ways as a sum of consecutive naturals, for example, 38259261 + ... + 38259466.

It is an arithmetic number, because the mean of its divisors is an integer number (1989486928).

Almost surely, 2^7881428881 is an apocalyptic number.

It is an amenable number.

7881428881 is a deficient number, since it is larger than the sum of its proper divisors (76518831).

7881428881 is a wasteful number, since it uses less digits than its factorization.

7881428881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76518830.

The product of its digits is 1835008, while the sum is 55.

The square root of 7881428881 is about 88777.4119976472. The cubic root of 7881428881 is about 1990.0698510872.

The spelling of 7881428881 in words is "seven billion, eight hundred eighty-one million, four hundred twenty-eight thousand, eight hundred eighty-one".