7881111120 has 80 divisors (see below), whose sum is σ = 24587176320. Its totient is φ = 2088233472.

The previous prime is 7881111113. The next prime is 7881111127. The reversal of 7881111120 is 211111887.

It is an interprime number because it is at equal distance from previous prime (7881111113) and next prime (7881111127).

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×7881111120² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7881111127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66900 + ... + 142259.

It is an arithmetic number, because the mean of its divisors is an integer number (307339704).

Almost surely, 2^7881111120 is an apocalyptic number.

It is an amenable number.

7881111120 is an abundant number, since it is smaller than the sum of its proper divisors (16706065200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7881111120 is a wasteful number, since it uses less digits than its factorization.

7881111120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209332 (or 209326 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 30.

The square root of 7881111120 is about 88775.6223295562. The cubic root of 7881111120 is about 1990.0431057218.

The spelling of 7881111120 in words is "seven billion, eight hundred eighty-one million, one hundred eleven thousand, one hundred twenty".